CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenues:
Revenue	$ 35,089	$ 30,456
Costs and expenses:
Cost of revenues	88	168
Sales and marketing	3,241	4,999
Research and development	4,150	5,014
General and administrative	9,835	18,055
Total costs and expenses	17,314	28,236
Operating income	17,775	2,220
Interest and other income	1,244	271
Other income (expense), net	(1,729)	668
Income before benefit from (provision for) income taxes	17,290	3,159
Benefit from (provision for) income taxes	(4,806)	2,242
Net income	$ 12,484	$ 5,401
Basic net income (loss) per share (in dollars per share)	$ 0.40	$ 0.19
Shares used in calculating basic net income (loss) per share (in shares)	31,459	28,117
Diluted net income (loss) per share (in dollars per share)	$ 0.39	$ 0.19
Shares used in calculating diluted net income (loss) per share (in shares)	31,769	28,477
Other comprehensive income, net of tax
Change in unrealized gains (losses) on available-for-sale securities	$ 290	$ (2)
Total other comprehensive income (loss)	290	(2)
Total comprehensive income	12,774	5,399
Royalty and license
Revenues:
Revenue	34,689	30,176
Development, services, and other
Revenues:
Revenue	$ 400	$ 280