CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues:
Total revenues	$ 9,482	$ 14,006	$ 23,539	$ 29,297
Operating expenses:
Sales and marketing	367	282	861	990
Research and development	30	254	259	1,118
General and administrative	2,566	2,540	9,528	8,550
Total operating expenses	2,963	3,076	10,648	10,658
Operating income	6,519	10,930	12,891	18,639
Interest and other income (loss), net	(2,554)	(2,348)	10,731	(6,413)
Income before provision for income taxes	3,965	8,582	23,622	12,226
Provision for income taxes	(1,285)	(877)	(5,636)	(1,264)
Net income	$ 2,680	$ 7,705	$ 17,986	$ 10,962
Basic net income per share (in dollars per share)	$ 0.08	$ 0.23	$ 0.56	$ 0.33
Shares used in calculating basic net income per share (in shares)	32,523	33,201	32,254	33,601
Diluted net income per share (in dollars per share)	$ 0.08	$ 0.23	$ 0.55	$ 0.32
Shares used in calculating diluted net income per share (in shares)	32,750	33,682	32,586	34,035
Other comprehensive income, net of tax
Deferred gains on available-for-sale marketable debt securities	$ 320	$ 156	$ 776	$ (1,025)
Realized losses on available-for-sale marketable debt securities reclassified to net income	0	188	217	556
Total other comprehensive income	320	344	993	(469)
Total comprehensive income	3,000	8,049	18,979	10,493
Royalty and license
Revenues:
Total revenues	9,474	13,931	23,401	29,079
Development, services, and other
Revenues:
Total revenues	$ 8	$ 75	$ 138	$ 218