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Net Loss per Share - Warrants and Contingent Equity Liability (Details) - $ / shares
1 Months Ended 3 Months Ended 9 Months Ended
May 09, 2017
May 31, 2017
Feb. 29, 2016
Jul. 31, 2016
Sep. 30, 2017
Jan. 26, 2017
Contingent Equity Liability            
Issuance of common shares     429,000 1,090,500    
BMS Agreement | Product related collaborative arrangements            
Contingent Equity Liability            
Issuance of common shares   1,345,374        
IPO            
Contingent Equity Liability            
Issuance of common shares 9,900,000          
IPO | BMS Agreement | Product related collaborative arrangements            
Contingent Equity Liability            
Issuance of common shares   1,345,374        
Common Shares            
Contingent Equity Liability            
Issuance of common shares         11,385,000  
Common Shares | Common stock warrants issued in connection with the Credit Agreement | Credit Agreement            
Warrants            
Exercise price (in dollars per share)           $ 9.2911
Common Shares | Common stock warrants issued to Guarantor in connection with the Credit Agreement | Credit Agreement            
Warrants            
Shares that warrant can purchase           107,500
Common Shares | Common stock warrants issued to Co-Guarantor in connection with the Credit Agreement | Credit Agreement            
Warrants            
Shares that warrant can purchase           107,500