Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue:
Revenue	$ 442,575	$ 410,561	$ 266,980
Cost of revenue:
Cost of revenue	262,939	260,314	167,382
Gross profit	179,636	150,247	99,598
Operating expenses:
Research and development	51,876	43,071	34,402
Sales and marketing	34,608	28,532	23,839
General and administrative	33,193	30,802	24,452
Restructuring charges			282
Total operating expenses	119,677	102,405	82,975
Income from operations	59,959	47,842	16,623
Other (expense) income:
Interest income	2,328	714	238
Interest expense	(5,110)	(5,121)	(5,073)
Other, net	(2,472)	396	(764)
Total other expense	(5,254)	(4,011)	(5,599)
Income before income taxes	54,705	43,831	11,024
Income tax provision (benefit)	8,820	(83,128)	23
Net income	$ 45,885	$ 126,959	$ 11,001
Net income per share:
Basic (in dollars per share)	$ 1.42	$ 4.11	$ 0.38
Diluted (in dollars per share)	$ 1.35	$ 3.80	$ 0.36
Shares used in computing net income per share:
Basic weighted average common shares	32,286	30,866	29,195
Diluted weighted average common shares	34,002	33,436	30,947
Product
Revenue:
Revenue	$ 415,922	$ 387,124	$ 244,295
Cost of revenue:
Cost of revenue	236,446	234,932	149,007
Services
Revenue:
Revenue	26,653	23,437	22,685
Cost of revenue:
Cost of revenue	$ 26,493	$ 25,382	$ 18,375