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