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Fair Value Measurements - Estimated fair value of Level 3 (Details) - Level 3 - Recurring
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning value of Level 3 liability $ 3
Change in fair value (1)
Ending fair value of level 3 liability $ 2