Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity and Capital Stock - RSU activity (Details)

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Shareholders' Equity and Capital Stock - RSU activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
RSU Rollforward      
Number of RSUs Unvested, Beginning Balance 985,496 1,175,952 1,273,990
Granted, RSU 713,106 470,756 541,658
Number of RSUs Vested (542,674) (621,092) (575,818)
Number of RSUs Forfeited   (40,120) (63,878)
Number of RSUs Unvested, Ending Balance 1,155,928 985,496 1,175,952
Number of RSUs Unvested, Beginning Balance, Weighted average grant date fair value $ 0.67 $ 0.65 $ 0.60
Granted, Weighted average grant date fair value 0.61 0.71 0.69
Vested, Weighted average grant date fair value 0.68 0.63 0.69
Forfeited, Weighted average grant date fair value   0.57 0.58
Number of RSUs Unvested, Ending Balance, Weighted Average Grant Date Fair Value $ 0.65 $ 0.67 $ 0.65