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Summary of Significant Accounting Policies - Reconciliation of Liabilities (Details) - Fair value, inputs, level 3 - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Beginning balance $ 276 $ 135 $ 266
Vested portion of liability classified equity award 63 39 107
Change in fair value measurement 201 102 (238)
Ending balance $ 540 $ 276 $ 135