Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue:
Revenue	$ 119,333	$ 102,790	$ 241,518	$ 189,683
Cost of revenue:
Cost of revenue	70,333	63,728	145,362	115,907
Gross profit	49,000	39,062	96,156	73,776
Operating expenses:
Research and development	12,553	11,256	24,786	21,151
Sales and marketing	8,912	7,485	17,323	14,534
General and administrative	8,268	7,791	16,278	14,848
Total operating expenses	29,733	26,532	58,387	50,533
Income from operations	19,267	12,530	37,769	23,243
Other (expense) income:
Interest income	515	111	925	180
Interest expense	(1,127)	(1,336)	(2,464)	(2,447)
Other, net	(1,016)	16	(1,118)	(138)
Total other expense	(1,628)	(1,209)	(2,657)	(2,405)
Income before income taxes	17,639	11,321	35,112	20,838
Income tax provision (benefit)	2,970	(2,611)	6,528	(2,600)
Net income	$ 14,669	$ 13,932	$ 28,584	$ 23,438
Net income per share:
Basic (in dollars per share)	$ 0.46	$ 0.46	$ 0.89	$ 0.78
Diluted (in dollars per share)	$ 0.43	$ 0.42	$ 0.84	$ 0.72
Shares used in computing net income per share:
Basic weighted average common shares	32,214	30,589	32,154	30,183
Diluted weighted average common shares	33,942	33,168	34,048	32,779
Product
Revenue:
Revenue	$ 112,521	$ 96,539	$ 228,543	$ 178,517
Cost of revenue:
Cost of revenue	63,913	57,689	132,287	104,486
Services
Revenue:
Revenue	6,812	6,251	12,975	11,166
Cost of revenue:
Cost of revenue	$ 6,420	$ 6,039	$ 13,075	$ 11,421