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Fair Value Measurements - Roll Forward of Preferred Stock Derivative (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance $ 3,117
Issuances 15,121
Change in fair value 223
Settlements (3,005)
Ending balance $ 15,456