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Net Loss Per Share - Anti-Dilutive Securities (Details) - $ / shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share        
Anti-dilutive stock options not considered in computing diluted earnings per common share 26,876 12,499 25,983 12,478
Unvested Stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share        
Anti-dilutive stock options not considered in computing diluted earnings per common share 605 417 548 396
Shares excluded as performance conditions not yet satisfied 4,100 16,400 4,100 16,400
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 12,647   11,891  
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 1,542   1,462  
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 12,082 12,082
Exercise price (per share) $ 11.50   $ 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   $ 17.50  
Number of trading days considered for share price     20 days  
Total number of trading days considered     30 days