CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Revenue	$ 7,596	$ 10,624	$ 19,521	$ 24,489
Costs and expenses:
Cost of revenues	32	62	138	117
Sales and marketing	1,096	1,688	4,067	4,876
Research and development	920	1,933	3,932	6,066
General and administrative	2,963	8,216	14,406	35,359
Total costs and expenses	5,011	11,899	22,543	46,418
Operating income (loss)	2,585	(1,275)	(3,022)	(21,929)
Interest and other income (loss), net	174	(24)	334	1,106
Income (loss) before benefit from (provision for) income taxes	2,759	(1,299)	(2,688)	(20,823)
Benefit from (provision for) income taxes	96	(88)	3	(200)
Net income (loss)	$ 2,855	$ (1,387)	$ (2,685)	$ (21,023)
Basic net loss per share (in dollars per share)	$ 0.11	$ (0.04)	$ (0.09)	$ (0.67)
Shares used in calculating basic net loss per share (in shares)	26,898	31,711	28,507	31,461
Diluted net loss per share (in dollars per share)	$ 0.11	$ (0.04)	$ (0.09)	$ (0.67)
Shares used in calculating diluted net loss per share (in shares)	27,134	31,711	28,507	31,461
Other comprehensive income (loss)
Change in unrealized gains (loss) on short-term investments	$ 0	$ (6)	$ (2)	$ 16
Total other comprehensive income (loss)	0	(6)	(2)	16
Total comprehensive income (loss)	2,855	(1,393)	(2,687)	(21,007)
Royalty and license
Revenues:
Revenue	7,531	10,549	19,306	24,264
Development, services, and other
Revenues:
Revenue	$ 65	$ 75	$ 215	$ 225