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Stockholders' Equity - Common Stock and Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Feb. 16, 2018
Feb. 15, 2018
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Collaborative Agreements              
Common stock issued from underwriting agreement (in shares)     18,700,000        
Proceeds of exercise of warrants         $ 812 $ 3,617  
Proceeds from issuance of common stock, net of issuance costs     $ 189,000   188,994 $ 294,584  
Exchange agreement, aggregate principal amount         $ 247,200    
Shares authorized for issuance (in shares)         44,000,000.0    
Common stock, par value (in dollars per share)         $ 0.01   $ 0.01
Contingent consideration, milestone payment       $ 9,000      
Milestone payment, stock issued as consideration         $ 9,000    
Common Stock              
Collaborative Agreements              
Common stock issued from underwriting agreement (in shares)         18,720,930 20,239,839  
Milestone payment, stock issued as consideration       $ 9,300      
Underwritten Offering              
Collaborative Agreements              
Stock issued (in dollars per share)     $ 10.75        
Common Stock              
Collaborative Agreements              
Common stock issued from underwriting agreement (in shares) 885,000 19,400,000          
Outstanding warrants, convertible to common stock              
Collaborative Agreements              
Common stock issued from underwriting agreement (in shares)         101,787    
Proceeds of exercise of warrants         $ 800    
Outstanding warrants, convertible to common stock | Common Stock              
Collaborative Agreements              
Warrants exercise price (in dollars per share)         $ 7.98