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Equity - Equity Incentive Plan (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
May 18, 2020 | Apr. 01, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Share-based compensation |  |  |  |  |  |  |
Warrants and Rights Remaining Term |  |  |  |  | 1 year |  |
Warrants Intrinsic Value Outstanding |  |  | $ 1,600,000 |  | $ 1,600,000 |  |
Inducement Stock Options [Member] |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  | 13,000 | $ 26,000 | 26,000 | $ 85,000 |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  | $ 39,000 |  | $ 39,000 |  |
Contractual life |  |  |  |  | 10 years |  |
Inducement Stock Options [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Exercise price (in dollars per share) |  |  |  |  | $ 1.16 |  |
Equity Incentive Plan [Member] |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Number of common stock reserved for issuance |  |  | 4,005,714 |  | 4,005,714 |  |
Maximum increase in available number of authorized shares as a percentage of new shares issued |  |  |  |  | 15.00% |  |
Reserved but unissued shares under the Plan, end of period (in shares) |  |  | 444,161 |  | 444,161 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number |  |  | 2,320,583 |  | 2,320,583 |  | 1,461,073
Allocated Share-based Compensation Expense |  |  | $ 48,000 | $ 115,000 | $ 115,000 | $ 289,000 |
Shares Reserved Unissued |  |  | 738,091 |  | 738,091 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  | $ 180,000 |  | $ 180,000 |  |
Stock options awards for directors | 79,500 | 94,500 |  |  |  |  |
Exercise price (in dollars per share) | $ 0.54 | $ 0.72 |  |  |  |  |
Contractual life | 10 years |  |  |  |  |  |
Equity Incentive Plan [Member] | Inducement Stock Options [Member] |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Share-based Compensation Outstanding - Reserved but unissued shares under the Plan |  |  | 2,675,744 |  | 2,675,744 |  | 2,131,058
Board of Directors [Member] | Equity Incentive Plan [Member] |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Share based compensation grants |  |  | 34,000 | 87,000 | 69,000 | 69,000 |

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