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
6 Months Ended
Jan. 08, 2018
Jun. 30, 2018
Jun. 30, 2017
Agreements with Incyte Corporation      
Aggregate purchase price   $ 68,179 $ 32,641
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