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Equity - Stock Grants (Details) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 31, 2018 | Dec. 31, 2018 | Dec. 31, 2019
Share-based compensation |  |  |
Shares issued for board service ($1.85 per share) | $ 212,000 | $ 212,000 |
Shares issued for board service ($1.85 per share) (in shares) | 114,865 |  |
Common stock, par value (in dollars per share) |  | $ 0.0001 | $ 0.0001
Common Stock |  |  |
Share-based compensation |  |  |
Shares issued for board service ($1.85 per share) |  | $ 0 |
Shares issued for board service ($1.85 per share) (in shares) |  | 114,865 |

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