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Net Loss Per Share - Anti-Dilutive Securities (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Anti-dilutive stock options not considered in computing diluted earnings per common share 16,586 12,340
Unvested Stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Anti-dilutive stock options not considered in computing diluted earnings per common share 498 258
Shares excluded as performance conditions not yet satisfied 10,800 25,700
Convertible Preferred Stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Anti-dilutive stock options not considered in computing diluted earnings per common share 3,552  
Common Stock Warrants    
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Anti-dilutive stock options not considered in computing diluted earnings per common share 454  
IPO Warrants    
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Anti-dilutive stock options not considered in computing diluted earnings per common share 12,082 12,082
Exercise price (per share) $ 11.50  
Redemption price (per share) $ 0.01  
Number of days of prior notice require to redeem 30 days  
Sale price of stock (per share) $ 17.50  
Number of trading days considered for share price 20 days  
Total number of trading days considered 30 days