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Stockholders' Equity - Warrants (Details) - Warrant - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Number of Other than Options |  |  |  |  |
Outstanding and exercisable, beginning balance (in shares) |  |  | 579,815 |  |
Granted (in shares) |  |  | 0 |  |
Canceled (in shares) |  |  | 0 |  |
Exercised (in shares) |  |  | 0 |  |
Expired/Forfeited (in shares) |  |  | (463,750) |  |
Outstanding and exercisable, ending balance (in shares) | 116,065 |  | 116,065 |  | 579,815
Weighted Average Exercise Price |  |  |  |  |
Outstanding and exercisable, beginning balance (in dollars per share) |  |  | $ 4.63 |  |
Granted (in dollars per share) |  |  | 0 |  |
Canceled (in dollars per share) |  |  | 0 |  |
Exercised (in dollars per share) |  |  | 0 |  |
Expired/Forfeited (in dollars per share) |  |  | 5.00 |  |
Outstanding and exercisable, ending balance (in dollars per share) | $ 3.15 |  | $ 3.15 |  | $ 4.63
Weighted Average Remaining Contractual Life (in Years), Outstanding and exercisable |  |  | 2 years 9 months 29 days |  | 1 year 3 months 25 days
Aggregate Intrinsic Value, Outstanding and exercisable | $ 0 |  | $ 0 |  | $ 0
Other disclosures |  |  |  |  |
Compensation expense | $ 0 | $ 0 | $ 0 | $ 0 |
Five year expiration |  |  |  |  |
Stockholders' Equity |  |  |  |  |
Expiration period |  |  | 5 years |  |
Ten year expiration |  |  |  |  |
Stockholders' Equity |  |  |  |  |
Expiration period |  |  | 10 years |  |

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