CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues:
Revenues	$ 34,668	$ 27,419	$ 68,166	$ 51,619
Costs and Expenses:
Costs of revenues	12,042	10,785	23,571	21,448
Research and development	13,374	11,064	27,463	21,905
Selling, general and administrative	9,770	9,410	20,609	18,874
Amortization of acquired intangible assets	314	313	628	627
Interest and other expense (income), net	(991)	243	(1,301)	(198)
Income (loss) before income taxes	159	(4,396)	(2,804)	(11,037)
Income tax expense	1,306	88	2,493	1,044
Net loss	(1,147)	(4,484)	(5,297)	(12,081)
Other comprehensive loss:
Foreign currency translation adjustments, net of tax	(1,037)	216	(1,434)	(314)
Change in unrealized losses related to available-for-sale debt securities, net of tax		(6)	(34)	(4)
Total other comprehensive income (loss)	(1,037)	210	(1,468)	(318)
Comprehensive loss	$ (2,184)	$ (4,274)	$ (6,765)	$ (12,399)
Net loss per share, basic (in dollars per share)	$ (0.03)	$ (0.12)	$ (0.14)	$ (0.33)
Net loss per share, diluted (in dollars per share)	$ (0.03)	$ (0.12)	$ (0.14)	$ (0.33)
Weighted average common shares used to calculate net loss per share, basic (in shares)	37,028	37,004	37,316	36,989
Weighted average common shares used to calculate net loss per share, diluted (in shares)	37,028	37,004	37,316	36,989
Analytics [Member]
Revenues:
Revenues	$ 31,117	$ 19,578	$ 61,543	$ 38,971
Integrated Yield Ramp [Member]
Revenues:
Revenues	$ 3,551	$ 7,841	$ 6,623	$ 12,648