CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues:
Revenue	$ 7,159	$ 6,257
Costs and expenses:
Cost of revenues	29	44
Sales and marketing	1,106	1,716
Research and development	1,307	1,689
General and administrative	2,224	7,356
Total costs and expenses	4,666	10,805
Operating income (loss)	2,493	(4,548)
Interest and other income (loss), net	(316)	(228)
Income (loss) before provision for income taxes	2,177	(4,776)
Provision for income taxes	(141)	(52)
Net income (loss)	$ 2,036	$ (4,828)
Basic net loss per share (in dollars per share)	$ 0.07	$ (0.16)
Shares used in calculating basic net loss per share (in shares)	28,579	31,006
Diluted net loss per share (in dollars per share)	$ 0.07	$ (0.16)
Shares used in calculating diluted net loss per share (in shares)	29,180	31,006
Other comprehensive income (loss)
Change in unrealized gains (loss) on short-term investments	$ 0	$ (2)
Total other comprehensive income (loss)	0	(2)
Total comprehensive income (loss)	2,036	(4,830)
Royalty and license
Revenues:
Revenue	7,068	6,182
Development, services, and other
Revenues:
Revenue	$ 91	$ 75