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) - Incyte - Stock Purchase Agreement
$ / shares in Units, $ in Millions
1 Months Ended
Jan. 31, 2018
USD ($)
$ / shares
shares
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]  
Aggregate purchase price | $ $ 10.0
Shares issued | shares 793,021
Share price (in dollars per share) | $ / shares $ 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