Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net sales	$ 141,259	$ 112,362	$ 288,421	$ 228,172
Cost of sales	53,082	46,802	111,636	93,695
Gross margin	88,177	65,560	176,785	134,477
Operating expenses:
Sales, general and administrative	72,293	43,362	135,320	86,254
Research and development	29,560	23,493	55,941	46,847
Total operating expenses	101,853	66,855	191,261	133,101
Income (loss) from operations	(13,676)	(1,295)	(14,476)	1,376
Interest and other income, net	1,613	1,845	2,554	4,158
Income (loss) before provision for income taxes	(12,063)	550	(11,922)	5,534
Provision for (benefit from) income taxes	18,696	(188)	14,763	(1,623)
Net income (loss)	$ (30,759)	$ 738	$ (26,685)	$ 7,157
Net income (loss) per common and common equivalent shares:
Basic (in dollars per share)	$ (0.51)	$ 0.01	$ (0.44)	$ 0.12
Diluted (in dollars per share)	$ (0.51)	$ 0.01	$ (0.44)	$ 0.12
Weighted average number of common and common equivalent shares outstanding:
Basic (in shares)	60,346	59,187	59,977	59,051
Diluted (in shares)	60,346	60,000	59,977	59,876
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ (30,759)	$ 738	$ (26,685)	$ 7,157
Foreign currency translation adjustments	678	(108)	(1,694)	(58)
Comprehensive income (loss)	(30,081)	630	(28,379)	7,099
Product
Net sales	98,755	80,391	206,043	168,480
Cost of sales	43,825	38,220	92,709	77,820
Service
Net sales	42,504	31,971	82,378	59,692
Cost of sales	$ 9,257	$ 8,582	$ 18,927	$ 15,875