CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues:
Revenues	$ 27,419	$ 21,409	$ 51,619	$ 42,567
Costs and Expenses:
Costs of revenues	10,785	8,946	21,448	17,433
Research and development	11,064	7,754	21,905	16,344
Selling, general and administrative	9,410	7,737	18,874	15,632
Amortization of other acquired intangible assets	313	174	627	347
Interest and other expense (income), net	243	150	(198)	170
Loss before income taxes	(4,396)	(3,352)	(11,037)	(7,359)
Income tax expense (benefit)	88	300	1,044	(3,179)
Net loss	(4,484)	(3,652)	(12,081)	(4,180)
Other comprehensive loss:
Foreign currency translation adjustments, net of tax	216	207	(314)	41
Change in unrealized losses related to available-for-sale debt securities, net of tax	(6)		(4)
Total other comprehensive loss	210	207	(318)	41
Comprehensive loss	$ (4,274)	$ (3,445)	$ (12,399)	$ (4,139)
Net loss per share, basic and diluted (in dollars per share)	$ (0.12)	$ (0.11)	$ (0.33)	$ (0.13)
Weighted average common shares used to calculate net loss per share, basic and diluted (in shares)	37,004	32,886	36,989	32,795
Analytics [Member]
Revenues:
Revenues	$ 19,578	$ 15,172	$ 38,971	$ 28,420
Integrated Yield Ramp [Member]
Revenues:
Revenues	$ 7,841	$ 6,237	$ 12,648	$ 14,147