Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details)

v3.8.0.1
Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - Collaboration Agreement - Incyte - USD ($)
$ in Millions
12 Months Ended
Jan. 08, 2018
Dec. 31, 2017
Recently Adopted Accounting Pronouncements    
Revenue recognized under the agreement   $ 0.0
Subsequent event    
Recently Adopted Accounting Pronouncements    
Up-front consideration $ 10.0  
Up-front consideration, cash 2.5  
Up-front consideration, pre-paid research funding 7.5  
Maximum target selection milestone payments and option exercise fees the Company is eligible to receive 54.0  
Maximum development and regulatory milestone payments the Company is eligible to receive for each of the validated targets 50.0  
Maximum commercial milestone payments the Company is eligible to receive for each of the validated targets if products arising from collaboration are approved $ 65.0