v3.20.4

Stockholders' Equity - Warrants (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Number of Warrants |  |
Number of warrants, granted, series B preferred stock (in shares) |  | 9,262,500
Weighted Average Exercise Price per Warrant |  |
Weighted average exercise price per warrant, granted, series B preferred stock (in usd per share) |  | $ 1.62
Warrant |  |
Number of Warrants |  |
Warrant or right, outstanding, number, beginning balance (in shares) | 30,527,776 | 17,818,844
Number of warrants, granted, marathon debt (in shares) | 1,176,203 | 3,379,466
Number of warrants, granted, other (in shares) |  | 66,966
Number of warrants, exercised (in shares) | (30,502,763) | 0
Number of warrants, expired (in shares) | (45,540) |
Warrant or right, outstanding, number, beginning balance (in shares) | 1,155,676 | 30,527,776
Weighted Average Exercise Price per Warrant |  |
Weighted average exercise price per warrant outstanding, beginning balance (in usd per share) | $ 1.82 | $ 1.84
Weighted average exercise price per warrant, granted, marathon debt (in usd per share) | 28.26 | 2.26
Weighted average exercise price per warrant, granted, other (in usd per share) |  | 5.28
Weighted average exercise price per warrant, exercised (in usd per share) | 1.78 | 0
Weighted average exercise price per warrant, expired (in usd per share) | 1.60 |
Weighted average exercise price per warrant outstanding, ending balance (in usd per share) | $ 28.74 | $ 1.82

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