CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues:
Revenue	$ 8,743	$ 6,144	$ 13,865	$ 91,560
Costs and expenses:
Cost of revenues	40	94	55	129
Sales and marketing	1,579	1,570	3,188	2,790
Research and development	1,831	2,222	4,133	5,042
General and administrative	14,448	10,553	27,143	21,789
Total costs and expenses	17,898	14,439	34,519	29,750
Operating income (loss)	(9,155)	(8,295)	(20,654)	61,810
Interest and other income	532	375	1,130	606
Income (loss) before benefit (provision) for income taxes	(8,623)	(7,920)	(19,524)	62,416
Benefit (provision) for income taxes	3	162	(112)	(291)
Net income (loss)	$ (8,620)	$ (7,758)	$ (19,636)	$ 62,125
Basic net income (loss) per share (in dollars per share)	$ (0.27)	$ (0.25)	$ (0.63)	$ 2.06
Shares used in calculating basic net income (loss) per share (in shares)	31,578	30,527	31,335	30,116
Diluted net income (loss) per share (in dollars per share)	$ (0.27)	$ (0.25)	$ (0.63)	$ 2.00
Shares used in calculating diluted net income (loss) per share (in shares)	31,578	30,527	31,335	31,074
Other comprehensive income
Change in unrealized gains on short-term investments	$ 16	$ 5	$ 22	$ 10
Total other comprehensive income	16	5	22	10
Total comprehensive income (loss)	(8,604)	(7,753)	(19,614)	62,135
Royalty and license
Revenues:
Revenue	8,668	5,992	13,715	91,327
Development, services, and other revenue
Revenues:
Revenue	$ 75	$ 152	$ 150	$ 233