CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues:
Revenue	$ 10,624	$ 8,552	$ 24,489	$ 100,112
Costs and expenses:
Cost of revenues	62	61	117	190
Sales and marketing	1,688	1,664	4,876	4,454
Research and development	1,933	2,110	6,066	7,152
General and administrative	8,216	9,880	35,359	31,669
Total costs and expenses	11,899	13,715	46,418	43,465
Operating income (loss)	(1,275)	(5,163)	(21,929)	56,647
Interest and other income (loss)	(24)	545	1,106	1,151
Income (loss) before provision for income taxes	(1,299)	(4,618)	(20,823)	57,798
Provision for income taxes	(88)	(22)	(200)	(313)
Net income (loss)	$ (1,387)	$ (4,640)	$ (21,023)	$ 57,485
Basic net income (loss) per share (in dollars per share)	$ (0.04)	$ (0.15)	$ (0.67)	$ 1.89
Shares used in calculating basic net income (loss) per share (in shares)	31,711	30,780	31,461	30,340
Diluted net income (loss) per share (in dollars per share)	$ (0.04)	$ (0.15)	$ (0.67)	$ 1.83
Shares used in calculating diluted net income (loss) per share (in shares)	31,711	30,780	31,461	31,334
Other comprehensive income
Change in unrealized gains (loss) on short-term investments	$ (6)	$ (2)	$ 16	$ 8
Total other comprehensive income	(6)	(2)	16	8
Total comprehensive income (loss)	(1,393)	(4,642)	(21,007)	57,493
Royalty and license
Revenues:
Revenue	10,549	8,462	24,264	99,789
Development, services, and other
Revenues:
Revenue	$ 75	$ 90	$ 225	$ 323