Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net sales	$ 104,836	$ 90,262	$ 305,277	$ 249,147
Cost of sales	39,203	40,497	112,040	105,075
Gross margin	65,633	49,765	193,237	144,072
Operating expenses:
Sales, general and administrative	39,685	36,398	114,787	99,079
Research and development	21,982	14,166	55,602	39,618
Total operating expenses	61,667	50,564	170,389	138,697
Income (loss) from operations	3,966	(799)	22,848	5,375
Interest and other income, net	1,274	1,430	2,242	3,320
Income before provision for income taxes	5,240	631	25,090	8,695
Provision for (benefit from) income taxes	(471)	209	(2,032)	1,417
Net income	$ 5,711	$ 422	$ 27,122	$ 7,278
Net income per common and common equivalent shares:
Basic (in dollars per share)	$ 0.10	$ 0.01	$ 0.49	$ 0.14
Diluted (in dollars per share)	$ 0.10	$ 0.01	$ 0.47	$ 0.14
Weighted average number of common and common equivalent shares outstanding:
Basic (in shares)	58,340	52,831	55,681	52,663
Diluted (in shares)	59,805	53,843	57,254	53,762
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income	$ 5,711	$ 422	$ 27,122	$ 7,278
Foreign currency translation adjustments	(107)	(1,560)	(159)	(2,111)
Comprehensive income (loss)	5,604	(1,138)	26,963	5,167
Product
Net sales	80,923	73,985	238,618	208,351
Cost of sales	32,953	34,573	96,474	91,817
Service
Net sales	23,913	16,277	66,659	40,796
Cost of sales	$ 6,250	$ 5,924	$ 15,566	$ 13,258