Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue:
Product	$ 98,161	$ 59,302	$ 276,678	$ 180,336
Services	6,321	6,348	17,487	17,286
Total revenue	104,482	65,650	294,165	197,622
Cost of revenue:
Product	58,056	36,360	162,542	111,262
Services	6,675	5,186	18,096	13,709
Total cost of revenue	64,731	41,546	180,638	124,971
Gross profit	39,751	24,104	113,527	72,651
Operating expenses:
Research and development	11,003	8,493	32,154	25,607
Sales and marketing	6,801	5,992	21,335	17,742
General and administrative	8,112	5,988	22,960	18,262
Restructuring charges				282
Total operating expenses	25,916	20,473	76,449	61,893
Income from operations	13,835	3,631	37,078	10,758
Other (expense) income:
Interest income	219	53	399	161
Interest expense	(1,337)	(1,342)	(3,784)	(3,727)
Other, net	138	(55)		(352)
Total other expense	(980)	(1,344)	(3,385)	(3,918)
Income before income taxes	12,855	2,287	33,693	6,840
Income tax provision (benefit)	1,014	136	(1,586)	(196)
Net income	$ 11,841	$ 2,151	$ 35,279	$ 7,036
Net income per share:
Basic (in dollars per share)	$ 0.38	$ 0.07	$ 1.15	$ 0.24
Diluted (in dollars per share)	$ 0.35	$ 0.07	$ 1.07	$ 0.23
Shares used in computing net income per share:
Basic weighted average common shares	31,274	29,221	30,550	29,118
Diluted weighted average common shares	33,524	31,037	33,048	30,760