Shareholders' Equity and Capital Stock - addl information (Details)
$ / shares in Units, $ / shares in Units, $ in Thousands, $ in Thousands |
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1 Months Ended |
8 Months Ended |
12 Months Ended |
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Sep. 25, 2018
$ / shares
shares
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May 27, 2016
USD ($)
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Sep. 30, 2018
USD ($)
$ / shares
shares
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Feb. 29, 2016
USD ($)
$ / shares
shares
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Dec. 31, 2017
$ / shares
shares
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Dec. 31, 2019
CAD ($)
item
$ / shares
shares
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Dec. 31, 2019
USD ($)
item
shares
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Dec. 31, 2018
CAD ($)
$ / shares
shares
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Dec. 31, 2018
USD ($)
shares
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Dec. 31, 2017
CAD ($)
$ / shares
shares
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Dec. 31, 2017
USD ($)
shares
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Dec. 31, 2016
USD ($)
$ / shares
shares
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Dec. 31, 2019
USD ($)
$ / shares
shares
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Dec. 31, 2018
$ / shares
shares
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Dec. 31, 2017
$ / shares
shares
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Aug. 19, 2014
USD ($)
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| Stockholder's Equity Note [Line Items] |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Intrinsic Value | $ |
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$ 43
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| Common Stock Shares Issued In Exchange Of Restricted Shares Units |
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425,038
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425,038
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505,510
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505,510
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447,663
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447,663
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| Common Stock Shares Issued |
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159,729,403
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160,478,059
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159,729,403
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |
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323,618
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323,618
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496,838
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496,838
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871,717
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871,717
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| Sale of Stock, Consideration Received on Transaction | $ |
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$ 1,100
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$ 105
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| Sale of Stock, Consideration Received on Transaction After Deducting Other Costs | $ |
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$ 13
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| Stock Issued During Period, Shares, New Issues |
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1,536,169
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1,536,169
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| Share Price | (per share) |
$ 0.82
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$ 0.76
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$ 0.76
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| Shares Authorized Value | $ |
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$ 100,000
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| Stock issuance costs |
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$ 800
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$ 902
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$ 93
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| Payments Of Stock Issuance Costs | $ |
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$ 902
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$ 93
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| Proceeds from Issuance of Private Placement | $ |
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$ 10,000
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$ 10,000
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| Sale of Stock, Price Per Share | $ / shares |
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$ 0.50
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$ 0.65
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| Gross proceeds | $ |
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$ 5,700
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$ 1,200
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$ 108
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| Option period for underwriters |
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30 days
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| Sale of Stock, Number of Shares Issued in Transaction |
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12,921,000
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164,979
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| Option to purchase additional common shares by underwriters |
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1,829,268
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| Exercise of stock options | $ |
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$ 203
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$ 290
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$ 542
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| Warrant to purchase additional common shares by underwriters |
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914,634
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| Additional warrants acquired by underwriters |
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867,756
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| Common shares purchased by acquiring additional warrants by underwriters |
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433,878
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| Number of RSUs Vested |
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542,674
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542,674
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621,092
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621,092
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575,818
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575,818
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| Stock Issued During Period, Value, New Issues | $ |
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$ 7,399
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$ 1,076
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| Threshold of combined service and age | item |
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65
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65
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| Percent or RSUs that vest |
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542,674
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542,674
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621,092
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621,092
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575,818
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575,818
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| Minimum Service For RSU Plan |
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5 years
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5 years
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Number |
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9,459,401
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9,731,612
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9,459,401
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9,748,934
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11,076,583
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9,731,612
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9,459,401
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number |
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6,255,228
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| Stock based compensation | $ |
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$ 787
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$ 915
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$ 891
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ |
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500
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| Proceeds from Stock Options Exercised | $ |
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$ 203
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$ 290
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$ 542
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |
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713,106
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713,106
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470,756
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470,756
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541,658
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541,658
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| Granted, Options |
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2,852,386
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2,852,386
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2,182,955
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2,182,955
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2,666,644
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2,666,644
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| Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |
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$ 1.02
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$ 1.00
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$ 1.00
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$ 0.97
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| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price | $ / shares |
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$ 0.90
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$ 0.90
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| Capital Stock |
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| Stockholder's Equity Note [Line Items] |
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| Common Stock Shares Issued |
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146,531,933
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159,729,403
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146,531,933
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143,676,384
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160,478,059
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159,729,403
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146,531,933
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |
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323,618
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323,618
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496,838
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496,838
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871,717
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871,717
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| Stock Issued During Period, Shares, New Issues |
12,195,122
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12,195,122
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12,195,122
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1,536,169
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1,536,169
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| Exercise of stock options | $ |
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$ 288
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$ 415
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$ 795
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| Stock Issued During Period, Value, New Issues | $ |
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$ 7,399
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$ 1,076
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| Warrants |
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| Stockholder's Equity Note [Line Items] |
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| Number of securities called by each warrant |
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0.5
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| Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |
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$ 1.00
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| In Money Stock Option [Member] |
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| Stockholder's Equity Note [Line Items] |
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| Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options | $ |
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$ 1,500
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| Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition |
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2 years 3 months 18 days
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2 years 3 months 18 days
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| Restricted Stock Units (RSUs) [Member] |
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| Stockholder's Equity Note [Line Items] |
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| Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options | $ |
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$ 600
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| Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition |
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1 year 7 months 6 days
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1 year 7 months 6 days
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| Restricted Stock Units (RSUs) [Member] | Capital Stock |
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| Stockholder's Equity Note [Line Items] |
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| Number of securities called by each warrant |
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1
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| Employee Stock Option [Member] |
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| Stockholder's Equity Note [Line Items] |
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| Vesting period |
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3 years
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| Proceeds from Stock Options Exercised | $ |
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$ 200
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$ 400
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$ 500
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| First Anniversary [Member] | Employee Stock Option [Member] |
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| Stockholder's Equity Note [Line Items] |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Percentage |
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33.30%
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| Second Anniversary [Member] |
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| Stockholder's Equity Note [Line Items] |
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| Number of RSUs Vested |
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100
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100
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| Percent or RSUs that vest |
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100
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100
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| Second Anniversary [Member] | Employee Stock Option [Member] |
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| Stockholder's Equity Note [Line Items] |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Percentage |
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33.30%
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| Third Anniversary (Member) | Employee Stock Option [Member] |
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| Stockholder's Equity Note [Line Items] |
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| Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Percentage |
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33.40%
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| Maximum |
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| Stockholder's Equity Note [Line Items] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price | $ / shares |
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$ 0.93
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| Minimum |
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| Stockholder's Equity Note [Line Items] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price | $ / shares |
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$ 0.79
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$ 0.91
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