Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net sales	$ 130,837	$ 104,836	$ 359,009	$ 305,277
Cost of sales	50,668	39,203	144,363	112,040
Gross margin	80,169	65,633	214,646	193,237
Operating expenses:
Sales, general and administrative	48,424	39,685	134,678	114,787
Research and development	25,129	21,982	71,976	55,602
Total operating expenses	73,553	61,667	206,654	170,389
Income from operations	6,616	3,966	7,992	22,848
Interest and other income (expense), net	1,820	1,274	5,978	2,242
Income before provision for income taxes	8,436	5,240	13,970	25,090
Provision for (benefit from) income taxes	2,332	(471)	709	(2,032)
Net income	$ 6,104	$ 5,711	$ 13,261	$ 27,122
Net income per common and common equivalent shares:
Basic (in dollars per share)	$ 0.10	$ 0.10	$ 0.22	$ 0.49
Diluted (in dollars per share)	$ 0.10	$ 0.10	$ 0.22	$ 0.47
Weighted average number of common and common equivalent shares outstanding:
Basic (in shares)	59,278	58,340	59,128	55,681
Diluted (in shares)	60,059	59,805	59,938	57,254
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 6,104	$ 5,711	$ 13,261	$ 27,122
Foreign currency translation adjustments	(227)	(107)	(285)	(159)
Comprehensive income	5,877	5,604	12,976	26,963
Product
Net sales	96,497	80,923	264,977	238,618
Cost of sales	42,445	32,953	120,265	96,474
Service
Net sales	34,340	23,913	94,032	66,659
Cost of sales	$ 8,223	$ 6,250	$ 24,098	$ 15,566