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Fair Value Measurements - Assets and Liabilities at Fair Value Changes in Level 3 Liabilities (Details) - Fair value on a recurring basis
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Warrant liability  
Fair Value of Assets and Liabilities Measured at Fair Value on a Recurring Basis  
Beginning balance $ 3,241
Change in the fair value of liability (1,101)
Ending balance 2,140
Future tranche right liability  
Fair Value of Assets and Liabilities Measured at Fair Value on a Recurring Basis  
Beginning balance 46,436
Change in the fair value of liability (20,711)
Ending balance $ 25,725