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Equity - Stock Options - Valuation assumptions (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Share-based compensation |  |
Granted (in shares) | 1,328,718 | 224,000
Exercise price (in dollars per share) | $ 1.32 | $ 1.94
Expected life | 5 years 9 months | 6 years 2 months 12 days
Weighted average volatility | 71.00% | 70.00%
Forfeiture rate | 20.00% | 15.00%
Weighted average risk-free interest rate | 2.52% | 2.74%
Expected dividend rate | 0.00% | 0.00%
Fair value of options granted (in dollars) | $ 664,000 |
Minimum [Member] |  |
Share-based compensation |  |
Vesting period | 1 year |
Maximum [Member] |  |
Share-based compensation |  |
Vesting period | 3 years |
Stock Options [Member] |  |
Share-based compensation |  |
Granted (in shares) | 1,328,718 | 224,000
Stock Issued During Period In Lieu of Cash Bonus |  | 159,100
Exercise price (in dollars per share) |  | $ 1.94
Contractual life | 10 years | 10 years
Stock Options [Member] | Minimum [Member] |  |
Share-based compensation |  |
Exercise price (in dollars per share) | $ 0.87 | $ 1.85
Vesting period |  | 3 years
Stock Options [Member] | Maximum [Member] |  |
Share-based compensation |  |
Exercise price (in dollars per share) | $ 1.21 | $ 2.10
Vesting period |  | 4 years
Stock Options [Member] | Chief Executive Officer [Member] |  |
Share-based compensation |  |
Granted (in shares) | 258,618 |
Stock Options [Member] | Chief Executive Officer [Member] | Inducement Stock Options [Member] |  |
Share-based compensation |  |
Granted (in shares) | 600,000 |
Stock Options [Member] | Director [Member] |  |
Share-based compensation |  |
Estimated common stock subject to options issued | 381,000 |
Stock Options [Member] | Other Employees [Member] |  |
Share-based compensation |  |
Granted (in shares) | 530,000 |

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