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Fair Value Measurements - Change in the warrant liabilities (Details) - Warrant liabilities
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Fair value as of December 31, 2020 $ 28,708
Change in fair value 16,747
Fair value as of March 31, 2021 $ 45,455