CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue:
Collaboration revenue	$ 0	$ 0	$ 0	$ 406
License revenue	0	28,650	425	28,750
Total revenue	0	28,650	425	29,156
Operating expenses:
Research and development	3,619	2,754	9,402	10,684
General and administrative	1,631	6,366	6,085	11,984
Loss from change in fair value of contingent consideration	3,900	0	7,600	0
Total operating expenses	9,150	9,120	23,087	22,668
(Loss) income from operations	(9,150)	19,530	(22,662)	6,488
Other income (expense):
Other income (expense), net	45	(43)	180	96
Loss on extinguishment of debt	0	0	0	(915)
Interest expense	0	0	0	(247)
Total other income (expense), net	45	(43)	180	(1,066)
Net (loss) income and comprehensive (loss) income	$ (9,105)	$ 19,487	$ (22,482)	$ 5,422
Net (loss) income per share — basic (in dollars per share)	$ (0.37)	$ 0.95	$ (0.91)	$ 0.27
Weighted-average number of common shares used in net (loss) income per share- basic (in shares)	24,691	20,495	24,663	20,004
Net (loss) income per share - diluted (in dollars per share)	$ (0.37)	$ 0.91	$ (0.91)	$ 0.26
Weighted-average number of common shares used in net (loss) income per share - diluted (in shares)	24,691	21,423	24,663	20,796