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Fair Value Measurements - Changes in Estimated Fair Value of Assets with Unobservable Inputs (Details) - Level 3
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at beginning of period $ 0
Additions 11,424
Change in fair value measurement (24)
Balance at end of period $ 11,400