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Stockholders' Equity - Stock Options and Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Warrants, Number of Shares [Roll Forward] |  |  |
Warrants, Outstanding, Beginning of Period (in shares) | 2,638,355 | 2,638,355 |
Warrants, Granted (in shares) |  | 19,519,393 |
Warrants, Exercised (in shares) |  | (801,148) |
Warrants, Forfeited (in shares) |  | 0 |
Warrants, Expired (in shares) |  | 0 |
Warrants, Outstanding, End of Period (in shares) |  | 21,356,600 |
Warrants Weighted Average Exercise Price [Roll Forward] |  |  |
Warrants Outstanding, Beginning of Period (in dollars per share) | $ 2.18 | $ 2.18 |
Warrants, Granted (in dollars per share) |  | 2.90 |
Warrants, Exercised (in dollars per share) |  | 2.19 |
Warrants, Forfeited (in dollars per share) |  | 0 |
Warrants, Expired (in dollars per share) |  | 0 |
Warrants Outstanding, End of Period (in dollars per share) |  | $ 2.84 |
Warrants, Outstanding, Weighted Average Remaining Contractual Term | 4 years 11 months 23 days | 4 years 7 months 17 days |
Warrants Outstanding, Aggregate Intrinsic Value |  | $ 0 | $ 0
Warrants, Vested and expected to vest (in shares) |  | 21,356,600 |
Weighted Average Exercise Price, Warrants Vested And Expected To Vest |  | $ 2.84 |
Warrants, Vested and expected to vest, Weighted Average Remaining Contractual Term |  | 4 years 7 months 17 days |
Warrants, Vested and expected to vest, Aggregate Intrinsic Value |  | $ 0 |
Warrants, Vested (in shares) |  | 21,356,600 |
Warrants, Vested, Weighted Average Exercise Price (in dollars per share) |  | $ 2.84 |
Warrants, Vested, Weighted Average Remaining Contractual Term |  | 4 years 7 months 17 days |
Warrants, Vested, Aggregate Intrinsic Value |  | $ 0 |
US Equity Plan [Member] |  |  |
Options, Outstanding [Roll Forward] |  |  |
Options, Outstanding, Beginning of Period (in shares) | 963,700 | 963,700 |
Options, Granted (in shares) |  | 1,314,790 |
Options, Exercised (in shares) |  | (7,250) |
Options, Forfeited (in shares) |  | (19,492) |
Options, Expired (in shares) |  | (109,549) |
Options, Outstanding, End of Period (in shares) |  | 2,142,199 |
Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |
Options, Outstanding. Beginning of Period (in dollars per share) | $ 14.64 | $ 14.64 |
Options, Granted (in dollars per share) |  | 1.32 |
Options, Exercised (in dollars per share) |  | 3.28 |
Options, Forfeited (in dollars per share) |  | 1.92 |
Options, Expired (in dollars per share) |  | 34.12 |
Options, Outstanding, End of Period (in dollars per share) |  | $ 5.63 |
Options, Outstanding, Weighted Average Remaining Contractual Term | 5 years 10 months 9 days | 8 years 3 months 3 days |
Options, Outstanding, Aggregate Intrinsic Value |  | $ 0 | $ 0
Options, Vested and expected to vest (in shares) |  | 2,126,167 |
Options, Vested and expected to vest, Weighted Average Exercise Price (in dollars per share) |  | $ 5.65 |
Options, Vested and expected to vest, Weighted Average Remaining Contractual Term |  | 8 years 3 months 3 days |
Options, Vested and expected to vest, Aggregate Intrinsic Value |  | $ 0 |
Options, Vested (in shares) |  | 1,122,583 |
Options, Vested, Weighted Average Exercise Price (in dollars per share) |  | $ 9.26 |
Options, Vested, Weighted Average Remaining Contractual Term |  | 7 years 14 days |
Options, Vested, Aggregate Intrinsic Value |  | $ 0 |

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