Quarterly report pursuant to Section 13 or 15(d)

Agreements with Incyte Corporation -Stock Purchase Agreement (Details)

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Agreements with Incyte Corporation -Stock Purchase Agreement (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Jan. 08, 2018
Mar. 31, 2018
Agreements with Incyte Corporation    
Aggregate purchase price   $ 51,969
Incyte | Stock Purchase Agreement    
Agreements with Incyte Corporation    
Aggregate purchase price $ 10,000  
Shares issued 793,021  
Share price (in dollars per share) $ 12.61  
Premium to volume-weighted sale price of shares (as a percent) 30.00%  
Trading days within which the purchase price represents a thirty percent (30%) premium to the volume-weighted sale price of the shares 15 days