| Shareholders' Equity and Capital Stock - options activity (Details) | 3 Months Ended | 
|---|---|
| Mar. 31, 2020  $ / shares  shares | |
| Options Rollforward | |
| Outstanding, Beginning Balance | shares | 11,076,583 | 
| Granted, Options | shares | 0 | 
| Forfeited, Options | shares | (23,889) | 
| Outstanding Ending Balance, Options | shares | 11,052,694 | 
| Outstanding, Beginning Balance, Weighted-average exercise price | $ / shares | $ 0.64 | 
| Forfeited, Weighted-average exercise price | $ / shares | 0.61 | 
| Outstanding Ending Balance, Weighted-average exercise price | $ / shares | 0.64 | 
| Grant date intrinsic value | $ / shares | $ 0 | 
| X | ||||||||||
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- Definition The grant-date intrinsic value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- Definition Gross number of share options (or share units) granted during the period. No definition available. 
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- Definition Number of options outstanding, including both vested and non-vested options. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available. 
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| X | ||||||||||
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. No definition available. 
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