CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Revenue	$ 6,144	$ 7,030	$ 91,560	$ 16,254
Costs and expenses:
Cost of revenues	94	54	129	97
Sales and marketing	1,570	3,461	2,790	6,766
Research and development	2,222	2,826	5,042	6,022
General and administrative	10,553	15,600	21,789	31,132
Total costs and expenses	14,439	21,941	29,750	44,017
Operating income (loss)	(8,295)	(14,911)	61,810	(27,763)
Interest and other income	375	165	606	304
Income (loss) before benefit (provision) for income taxes	(7,920)	(14,746)	62,416	(27,459)
Net income (loss)	(7,758)	(14,845)	62,125	(27,710)
Benefit (provision) for income taxes	$ 162	$ (99)	$ (291)	$ (251)
Basic net loss per share (in dollars per share)	$ (0.25)	$ (0.51)	$ 2.06	$ (0.95)
Shares used in calculating basic net income (loss) per share (in shares)	30,527	29,193	30,116	29,109
Diluted net loss per share (in dollars per share)	$ (0.25)	$ (0.51)	$ 2.00	$ (0.95)
Shares used in computation of diluted net income (loss) per share (in shares)	30,527	29,193	31,074	29,109
Other comprehensive income (loss), net of tax
Change in unrealized gains (losses) on short-term investments	$ 5	$ (2)	$ 10	$ (24)
Total other comprehensive income (loss)	5	(2)	10	(24)
Total comprehensive income (loss)	(7,753)	(14,847)	62,135	(27,734)
Royalty and license
Revenues:
Revenue	5,992	6,785	91,327	15,791
Development, services, and other revenue
Revenues:
Revenue	$ 152	$ 245	$ 233	$ 463