CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues:
Revenue	$ 7,173	$ 7,596	$ 25,342	$ 19,521
Costs and expenses:
Cost of revenues	8	32	78	138
Sales and marketing	443	1,096	2,743	4,067
Research and development	803	920	3,442	3,932
General and administrative	2,246	2,963	7,106	14,406
Total costs and expenses	3,500	5,011	13,369	22,543
Operating income (loss)	3,673	2,585	11,973	(3,022)
Interest and other income (loss), net	438	174	162	334
Income (loss) before benefit from (provision for) income taxes	4,111	2,759	12,135	(2,688)
Benefit from (provision for) income taxes	(340)	96	(987)	3
Net income (loss)	$ 3,771	$ 2,855	$ 11,148	$ (2,685)
Basic net loss per share (in dollars per share)	$ 0.12	$ 0.11	$ 0.36	$ (0.09)
Shares used in calculating basic net loss per share (in shares)	32,474	26,898	30,693	28,507
Diluted net loss per share (in dollars per share)	$ 0.12	$ 0.11	$ 0.36	$ (0.09)
Shares used in calculating diluted net loss per share (in shares)	32,612	27,134	31,065	28,507
Other comprehensive income (loss)
Change in unrealized gains (loss) on short-term investments	$ 531	$ 0	$ 531	$ (2)
Total comprehensive income (loss)	4,302	2,855	11,679	(2,687)
Royalty and license
Revenues:
Revenue	7,068	7,531	25,017	19,306
Development, services, and other
Revenues:
Revenue	$ 105	$ 65	$ 325	$ 215