Statements of Comprehensive Loss - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenue:      
License and milestone fees   $ 1,710 $ 302
Collaborative revenue   2,093 2,201
Clinical compound revenue $ 86 0 674
Total revenue 86 3,803 3,177
Operating expenses:      
Research and development 49,253 21,221 15,068
General and administrative 9,233 7,770 6,181
Total operating expenses 58,486 28,991 21,249
Operating loss (58,400) (25,188) (18,072)
Other income 652 101 126
Loss before benefit from income taxes (57,748) (25,087) (17,946)
Benefit from income taxes 468 397 201
Net loss $ (57,280) $ (24,690) $ (17,745)
Net loss per share:      
Basic and Diluted $ (2.10) $ (1.00) $ (0.85)
Weighted average shares:      
Basic and Diluted 27,279,008 24,620,372 20,965,935
Other comprehensive income (loss), net of tax of $0:      
Change in unrealized gains (losses) on available for sale marketable securities $ 38 $ (35)  
Total comprehensive loss $ (57,242) $ (24,725) $ (17,745)