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Equity-Based Compensation - Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Equity-based compensation        
Equity-based compensation expense $ 1,814 $ 1,090 $ 3,432 $ 1,571
Research and development expense        
Equity-based compensation        
Equity-based compensation expense 638 542 1,217 786
General and administrative expense        
Equity-based compensation        
Equity-based compensation expense $ 1,176 $ 548 $ 2,215 $ 785