Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Segment Information and Revenue Recognition (Details)

v3.10.0.1
Summary of Significant Accounting Policies - Segment Information and Revenue Recognition (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
segment
Jun. 30, 2017
USD ($)
Number of operating segments | segment     1  
Revenue $ 0.4   $ 0.7  
Collaboration Agreement | Incyte        
Revenue $ 0.4   $ 0.7  
Research Agreement | Multinational Pharmaceutical Company | Before topic 606        
Revenue   $ 0.0   $ 1.1