Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net sales	$ 166,442	$ 130,837	$ 454,863	$ 359,009
Cost of sales	68,202	50,668	179,838	144,363
Gross margin	98,240	80,169	275,025	214,646
Operating expenses:
Sales, general and administrative	74,443	48,424	209,763	134,678
Research and development	29,246	25,129	85,187	71,976
Total operating expenses	103,689	73,553	294,950	206,654
Income (loss) from operations	(5,449)	6,616	(19,925)	7,992
Interest and other income, net	2,040	1,820	4,594	5,978
Income (loss) before provision for income taxes	(3,409)	8,436	(15,331)	13,970
Provision for (benefit from) income taxes	(2,536)	2,332	12,227	709
Net income (loss)	$ (873)	$ 6,104	$ (27,558)	$ 13,261
Net income (loss) per common and common equivalent shares:
Basic (in dollars per share)	$ (0.01)	$ 0.10	$ (0.45)	$ 0.22
Diluted (in dollars per share)	$ (0.01)	$ 0.10	$ (0.45)	$ 0.22
Weighted average number of common and common equivalent shares outstanding:
Basic (in shares)	63,496	59,278	61,159	59,128
Diluted (in shares)	63,496	60,059	61,159	59,938
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ (873)	$ 6,104	$ (27,558)	$ 13,261
Foreign currency translation adjustments	1,238	(227)	(456)	(285)
Comprehensive income (loss)	365	5,877	(28,014)	12,976
Product
Net sales	120,091	96,497	326,134	264,977
Cost of sales	57,798	42,445	150,507	120,265
Service
Net sales	46,351	34,340	128,729	94,032
Cost of sales	$ 10,404	$ 8,223	$ 29,331	$ 24,098