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Equity - Inducement Stock Options (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Granted (in shares) | 743,161 | 1,328,718
Exercise price (in dollars per share) | $ 1.07 | $ 1.32
Expected life | 10 years | 5 years 9 months
Weighted average volatility | 83.00% | 71.00%
Forfeiture rate | 0.00% | 20.00%
Weighted average risk-free interest rate | 0.71% | 2.52%
Expected dividend rate | 0.00% | 0.00%
Minimum [Member] |  |
Vesting period | 1 year |
Maximum [Member] |  |
Vesting period | 3 years |
Non-vested stock options |  |
Granted (in shares) | 176,000 |
Contractual life | 10 years |
Vesting period | 2 years |
Compensation expense | $ 52,000 | $ 111,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 13,000 |
Expected life |  | 5 years 9 months
Weighted average volatility |  | 71.00%
Forfeiture rate |  | 20.00%
Weighted average risk-free interest rate |  | 2.55%
Expected dividend rate |  | 0.00%
Non-vested stock options | Minimum [Member] |  |
Exercise price (in dollars per share) | $ 1.16 |
Non-vested stock options | Maximum [Member] |  |
Exercise price (in dollars per share) | $ 2.25 |
Non-vested stock options | Chief Executive Officer [Member] |  |
Granted (in shares) | 600,000 |
Non-vested stock options | 2011 Equity Incentive Plan [Member] |  |
Granted (in shares) | 258,618 |
Non-vested stock options | Non-Qualified Stock Option [Member] |  |
Granted (in shares) | 341,382 |

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