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Warrant - Schedule of Fair Value of Outstanding Warrants Recorded as Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Class of Warrant or Right [Line Items]    
Common stock warrant liabilities $ 0 $ 77,404
2015 Private warrants    
Class of Warrant or Right [Line Items]    
Common stock warrant liabilities $ 0 $ 77,404