Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net sales	$ 112,362	$ 99,226	$ 228,172	$ 200,441
Cost of sales	46,802	36,083	93,695	72,837
Gross margin	65,560	63,143	134,477	127,604
Operating expenses:
Sales, general and administrative	43,362	39,343	86,254	75,102
Research and development	23,493	18,501	46,847	33,620
Total operating expenses	66,855	57,844	133,101	108,722
Income (loss) from operations	(1,295)	5,299	1,376	18,882
Interest and other income (expense), net	1,845	(295)	4,158	968
Income before provision for income taxes	550	5,004	5,534	19,850
Provision for (benefit from) income taxes	(188)	(3,481)	(1,623)	(1,561)
Net income	$ 738	$ 8,485	$ 7,157	$ 21,411
Net income per common and common equivalent shares:
Basic (in dollars per share)	$ 0.01	$ 0.15	$ 0.12	$ 0.39
Diluted (in dollars per share)	$ 0.01	$ 0.15	$ 0.12	$ 0.38
Weighted average number of common and common equivalent shares outstanding:
Basic (in shares)	59,187	55,527	59,051	54,330
Diluted (in shares)	60,000	57,054	59,876	55,892
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 738	$ 8,485	$ 7,157	$ 21,411
Foreign currency translation adjustments	(108)	655	(58)	(52)
Comprehensive income	630	9,140	7,099	21,359
Product
Net sales	80,391	76,721	168,480	157,695
Cost of sales	38,220	31,087	77,820	63,521
Service
Net sales	31,971	22,505	59,692	42,746
Cost of sales	$ 8,582	$ 4,996	$ 15,875	$ 9,316