CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues:
Revenues	$ 29,555	$ 23,112	$ 81,174	$ 65,678
Costs and Expenses:
Costs of revenues	11,070	9,493	32,518	26,926
Research and development	10,657	8,328	32,562	24,672
Selling, general and administrative	9,609	8,420	28,482	24,052
Amortization of other acquired intangible assets	314	174	942	521
Interest and other expense (income), net	(194)	361	(391)	530
Loss before income taxes	(1,901)	(3,664)	(12,939)	(11,023)
Income tax expense (benefit)	506	(930)	1,549	(4,109)
Net loss	(2,407)	(2,734)	(14,488)	(6,914)
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	(226)	540	(540)	581
Change in unrealized losses related to available-for-sale debt securities, net of tax	1	(3)	(3)	(3)
Total other comprehensive income (loss)	(225)	537	(543)	578
Comprehensive loss	$ (2,632)	$ (2,197)	$ (15,031)	$ (6,336)
Basic (in dollars per share)	$ (0.06)	$ (0.08)	$ (0.39)	$ (0.21)
Diluted (in dollars per share)	$ (0.06)	$ (0.08)	$ (0.39)	$ (0.21)
Basic weighted-average shares outstanding (in shares)	37,221	35,479	37,067	33,696
Diluted weighted-average shares outstanding (in shares)	37,221	35,479	37,067	33,696
Analytics [Member]
Revenues:
Revenues	$ 27,194	$ 14,346	$ 66,165	$ 42,766
Integrated Yield Ramp [Member]
Revenues:
Revenues	$ 2,361	$ 8,766	$ 15,009	$ 22,912