Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues:
Licensing revenue	$ 3,500	$ 3,500	$ 3,500	$ 4,500
Product sales	824	44	932	133
Other, net	329	0	3,939	0
Total revenues	4,653	3,544	8,371	4,633
Operating expenses:
Cost of product sales	298	31	421	63
Research and development	8,263	5,988	24,209	13,949
General and administrative	3,506	4,082	11,086	7,378
Total operating expenses	12,067	10,101	35,716	21,390
Loss from operations	(7,414)	(6,557)	(27,345)	(16,757)
Interest and other income	7	2	15	3
Change in fair value of convertible preferred stock warrant liability	0	(127)	0	(4,277)
Net loss attributable to common stockholders	$ (7,407)	$ (6,682)	$ (27,330)	$ (21,031)
Earnings Per Share
Basic and diluted net loss per share attributable to common stockholders (in USD per share)	$ (0.37)	$ (0.55)	$ (1.45)	$ (4.85)
Weighted Average Number of Shares Outstanding, Diluted
Weighted-average shares used to compute basic and diluted net loss per share attributable to common stockholders (in shares)	20,131,260	12,128,810	18,822,517	4,332,480