Annual report pursuant to Section 13 and 15(d)

Fair Value Measurement - Warrants (Details)

v3.20.4
Fair Value Measurement - Warrants (Details) - Warrant - USD ($)
12 Months Ended
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