CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues:
Total revenues	$ 6,983	$ 7,983	$ 14,057	$ 15,291
Operating expenses:
Sales and marketing	398	218	494	704
Research and development	99	355	229	868
General and administrative	3,373	3,304	6,962	6,010
Total operating expenses	3,870	3,877	7,685	7,582
Operating income	3,113	4,106	6,372	7,709
Interest and other income (loss), net	6,759	(6,099)	13,285	(4,065)
Income (loss) before benefit from (provision for) income taxes	9,872	(1,993)	19,657	3,644
Benefit from (provision for) income taxes	(2,844)	174	(4,351)	(387)
Net income (loss)	$ 7,028	$ (1,819)	$ 15,306	$ 3,257
Basic net income (loss) per share (in dollars per share)	$ 0.22	$ (0.05)	$ 0.47	$ 0.1
Shares used in calculating basic net income (loss) per share (in shares)	32,583	33,616	32,474	33,638
Diluted net income (loss) per share (in dollars per share)	$ 0.21	$ (0.05)	$ 0.47	$ 0.1
Shares used in calculating diluted net income (loss) per share (in shares)	32,810	33,616	32,839	33,955
Other comprehensive income (loss), net of tax
Deferred gains on available-for-sale marketable debt securities	$ 365	$ 0	$ 929	$ 530
Realized losses on available-for-sale marketable debt securities reclassified to net income	(67)	(1,054)	(257)	(1,343)
Total other comprehensive income (loss)	298	(1,054)	672	(813)
Total comprehensive income (loss)	7,326	(2,873)	15,978	2,444
Royalty and license
Revenues:
Total revenues	6,918	7,918	13,927	15,148
Development, services, and other revenue
Revenues:
Total revenues	$ 65	$ 65	$ 130	$ 143