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Fair Value Measurement - Convertible Note (Details) - Convertible Notes - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, liability, beginning balance $ 0 $ 0
Fair value of new issuances 38,520,000 0
Conversion of Convertible Note into common stock (481,728) 0
Change in fair value for the year 981,728 0
Fair value, liability, ending balance $ 39,020,000 $ 0