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Equity - Inducement Stock Options - Valuation assumptions (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Inducement Stock Options [Member] |  |  |  |
Share-based compensation |  |  |  |
Contractual life |  |  | 10 years |
Vesting period |  |  | 2 years |
Fair value of options granted (in dollars) |  |  | $ 176,000 |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 39,000 |  | 39,000 |
Compensation expense | $ 13,000 | $ 26,000 | $ 26,000 | $ 85,000
Inducement Stock Options [Member] | Minimum [Member] |  |  |  |
Share-based compensation |  |  |  |
Exercise price (in dollars per share) |  |  | $ 1.16 |
Inducement Stock Options [Member] | Maximum [Member] |  |  |  |
Share-based compensation |  |  |  |
Exercise price (in dollars per share) |  |  | $ 2.25 |
Stock Option [Member] | Chief Executive Officer [Member] | Inducement Stock Options [Member] |  |  |  |
Share-based compensation |  |  |  |
Granted (in shares) |  |  |  | 600,000
2011 Equity Incentive Plan [Member] |  |  |  |
Share-based compensation |  |  |  |
Granted (in shares) |  |  | 258,618 |
Non-Qualified Stock Option [Member] | Inducement Stock Options [Member] |  |  |  |
Share-based compensation |  |  |  |
Granted (in shares) |  |  | 341,382 |

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