Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue:
Revenue	$ 95,374	$ 104,482	$ 336,892	$ 294,165
Cost of revenue:
Cost of revenue	55,461	64,731	200,823	180,638
Gross profit	39,913	39,751	136,069	113,527
Operating expenses:
Research and development	12,845	11,003	37,631	32,154
Sales and marketing	7,923	6,801	25,246	21,335
General and administrative	8,477	8,112	24,755	22,960
Total operating expenses	29,245	25,916	87,632	76,449
Income from operations	10,668	13,835	48,437	37,078
Other (expense) income:
Interest income	593	219	1,518	399
Interest expense	(1,323)	(1,337)	(3,787)	(3,784)
Other, net	(592)	138	(1,710)
Total other expense	(1,322)	(980)	(3,979)	(3,385)
Income before income taxes	9,346	12,855	44,458	33,693
Income tax provision (benefit)	508	1,014	7,036	(1,586)
Net income	$ 8,838	$ 11,841	$ 37,422	$ 35,279
Net income per share:
Basic (in dollars per share)	$ 0.27	$ 0.38	$ 1.16	$ 1.15
Diluted (in dollars per share)	$ 0.26	$ 0.35	$ 1.10	$ 1.07
Shares used in computing net income per share:
Basic weighted average common shares	32,365	31,274	32,225	30,550
Diluted weighted average common shares	33,973	33,524	34,032	33,048
Product
Revenue:
Revenue	$ 88,496	$ 98,161	$ 317,039	$ 276,678
Cost of revenue:
Cost of revenue	49,136	58,056	181,423	162,542
Services
Revenue:
Revenue	6,878	6,321	19,853	17,487
Cost of revenue:
Cost of revenue	$ 6,325	$ 6,675	$ 19,400	$ 18,096