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Net Loss Per Share - Anti-Dilutive Securities (Details) - $ / shares
shares in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Anti-dilutive stock options not considered in computing diluted earnings per common share 25,075 12,546
Unvested Stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Anti-dilutive stock options not considered in computing diluted earnings per common share 490 464
Shares excluded as performance conditions not yet satisfied 10,800 26,400
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 11,127  
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 1,376  
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