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Stockholders' Equity - Stock Options and Warrants (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Warrants, Number of Shares [Roll Forward] |  |
Warrants, Outstanding, Beginning of Period (in shares) | 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 | 2,638,355
Warrants Weighted Average Exercise Price [Roll Forward] |  |
Warrants Outstanding, Beginning of Period (in dollars per share) | $ 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 | $ 2.18
Warrants, Outstanding, Weighted Average Remaining Contractual Term | 4 years 10 months 17 days | 4 years 11 months 23 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 10 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 10 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 |
Options, Granted (in shares) | 176,875 |
Options, Exercised (in shares) | (7,250) |
Options, Forfeited (in shares) | (19,492) |
Options, Expired (in shares) | (108,624) |
Options, Outstanding, End of Period (in shares) | 1,005,209 | 963,700
Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |
Options, Outstanding. Beginning of Period (in dollars per share) | $ 14.64 |
Options, Granted (in dollars per share) | 1.59 |
Options, Exercised (in dollars per share) | 3.28 |
Options, Forfeited (in dollars per share) | 1.92 |
Options, Expired (in dollars per share) | 34.28 |
Options, Outstanding, End of Period (in dollars per share) | $ 10.55 | $ 14.64
Options, Outstanding, Weighted Average Remaining Contractual Term | 6 years 7 months 17 days | 5 years 10 months 9 days
Options, Outstanding, Aggregate Intrinsic Value | $ 5,100 | $ 0
Options, Vested and expected to vest (in shares) | 984,976 |
Options, Vested and expected to vest, Weighted Average Exercise Price (in dollars per share) | $ 10.72 |
Options, Vested and expected to vest, Weighted Average Remaining Contractual Term | 6 years 6 months 29 days |
Options, Vested and expected to vest, Aggregate Intrinsic Value | $ 4,900 |
Options, Vested (in shares) | 743,847 |
Options, Vested, Weighted Average Exercise Price (in dollars per share) | $ 13.31 |
Options, Vested, Weighted Average Remaining Contractual Term | 5 years 9 months 25 days |
Options, Vested, Aggregate Intrinsic Value | $ 700 |

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