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Stockholders' Equity - Schedule of Warrants (Details) - $ / shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 15, 2020
Number of Warrants |  |  |  |
Balance of warrants outstanding at the beginning of the period (in shares) | 10,589,482 | 3,649,341 |  |
Granted (in shares) | 5,831,451 | 7,437,454 |  |
Exercised (in shares) | (11,159,941) | (497,313) |  |
Balance of warrants outstanding at the end of the period (in shares) | 5,260,992 | 10,589,482 | 3,649,341 |
Weighted-Average Exercise Price Per Share |  |  |  |
Weighted average exercise price of warrants at the beginning of the period (in dollars per share) | $ 4.08 | $ 8.91 |  |
Granted (in dollars per share) | 1.70 | 1.87 |  |
Exercised (in dollars per share) | 2.31 | 6.60 |  |
Weighted average exercise price of warrants at the end of the period (in dollars per share) | $ 5.19 | $ 4.08 | $ 8.91 |
Weighted-Average Remaining Contractual Term |  |  |  |
Weighted-Average Remaining Contractual Term | 4 years 1 month 6 days | 3 years 8 months 12 days | 4 years 4 months 24 days |
Exercise price of warrants (in dollars per share) | $ 0.01 |  |  | $ 3.05
Pre-Funded Warrants |  |  |  |
Number of Warrants |  |  |  |
Balance of warrants outstanding at the beginning of the period (in shares) | 605,072 |  |  |
Granted (in shares) | 386,967 |  |  |
Exercised (in shares) | (992,039) |  |  |
Balance of warrants outstanding at the end of the period (in shares) |  | 605,072 |  |

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