Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Product sales	$ 6,600	$ 3,280	$ 12,186	$ 7,020
Research and development revenues	3,391	12,064	5,391	15,598
Revenue sharing arrangement	356	658	740	1,380
Total revenues	10,347	16,002	18,317	23,998
Costs and operating expenses:
Cost of product sales	3,790	2,221	6,792	4,710
Research and development	6,348	5,112	12,187	10,798
Selling, general and administrative	6,546	6,420	13,152	13,222
Total costs and operating expenses	16,684	13,753	32,131	28,730
Income (loss) from operations	(6,337)	2,249	(13,814)	(4,732)
Interest income	49	13	68	28
Other expenses, net	(34)	(49)	(12)	(46)
Income (loss) before income taxes	(6,322)	2,213	(13,758)	(4,750)
Benefit from income taxes	(42)	(26)	(18)	(15)
Net income (loss)	$ (6,280)	$ 2,239	$ (13,740)	$ (4,735)
Net income (loss) per share, basic (usd per share)	$ (0.13)	$ 0.06	$ (0.31)	$ (0.12)
Net income (loss) per share, diluted (usd per share)	$ (0.13)	$ 0.05	$ (0.31)	$ (0.12)
Weighted average common stock shares used in computing net income (loss) per share, basic (shares)	47,232	40,495	44,258	40,283
Weighted average common stock shares used in computing net income (loss) per share, diluted (shares)	47,232	41,568	44,258	40,283