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Equity - Inducement Stock Options (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
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%
Minimum [Member] |  |
Vesting period | 1 year |
Maximum [Member] |  |
Vesting period | 3 years |
Inducement Stock Options [Member] |  |
Granted (in shares) | 176,000 |
Contractual life | 10 years |
Vesting period | 2 years |
Compensation expense | $ 111,000 |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 65,000 |
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% |
Inducement Stock Options [Member] | Minimum [Member] |  |
Exercise price (in dollars per share) | $ 1.16 |
Inducement Stock Options [Member] | Maximum [Member] |  |
Exercise price (in dollars per share) | $ 2.25 |
Inducement Stock Options [Member] | Chief Executive Officer [Member] |  |
Granted (in shares) | 600,000 |
Inducement Stock Options [Member] | 2011 Equity Incentive Plan [Member] |  |
Granted (in shares) | 258,618 |
Inducement Stock Options [Member] | Non-Qualified Stock Option [Member] |  |
Granted (in shares) | 341,382 |

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