v3.20.4

Fair Value Measurement - Warrants (Details) - Warrant - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value, liability, beginning balance | $ 16,335,000 | $ 1,822,819
Exercise of warrants | (28,511,690) | 0
Change in fair value | 12,176,690 | 15,369,253
Reclassification to additional paid-in capital | 0 | (857,072)
Fair value, liability, ending balance | $ 0 | $ 16,335,000

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