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Equity-Based Awards - Stock Option Award Activities (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Quantity    
Outstanding beginning balance (in shares) 4,478,366  
Granted (in shares) 2,043,226  
Exercised (in shares) (39,766)  
Cancelled (in shares) (1,857,337)  
Forfeited (in shares) (433,620)  
Expired (in shares) (890,613)  
Outstanding ending balance (in shares) 3,300,256 4,478,366
Vested and exercisable ending balance (in shares) 1,091,946  
Exercise Price    
Outstanding beginning balance (in dollars per share) $ 21.46  
Granted (in dollars per share) 8.24  
Exercised (in dollars per share) 6.12  
Cancelled (in dollars per share) 22.86  
Forfeited (in dollars per share) 16.96  
Expired (in dollars per share) 20.26  
Outstanding ending balance (in dollars per share) 13.59 $ 21.46
Vested and exercisable at ending balance (in dollars per share) $ 20.43  
Remaining Contractual Term (years)    
Outstanding balance 7 years 10 months 24 days 7 years 4 months 24 days
Vested and exercisable ending balance 5 years 7 months 6 days  
Aggregate Intrinsic Value (in thousands)    
Outstanding balance $ 7,401 $ 8,000
Vested and exercisable ending balance $ 242  
Closing price of common stock (in dollars per share) $ 12.02