Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statements of Operations:
Revenue	$ 458,728	$ 445,596	$ 344,490
Cost of revenue	223,438	206,917	150,648
Gross profit	235,290	238,679	193,842
Operating expenses
Marketing and sales	72,976	68,533	56,856
Research and development	32,692	28,735	23,560
General and administrative	49,766	52,513	41,200
Total operating expenses	155,434	149,781	121,616
Income from operations	79,856	88,898	72,226
Other income, net	1,337	2,757	2,209
Income before income taxes	81,193	91,655	74,435
Provision for income taxes	17,538	15,067	22,657
Net income	$ 63,655	$ 76,588	$ 51,778
Net income per share:
Basic (in dollars per share)	$ 2.37	$ 2.84	$ 1.94
Diluted (in dollars per share)	$ 2.35	$ 2.81	$ 1.93
Shares used to compute net income per share:
Basic (in shares)	26,866,985	26,982,614	26,647,610
Diluted (in shares)	27,049,423	27,278,816	26,845,071
Other Comprehensive (Loss) Income, net of tax
Foreign currency translation adjustments	$ 1,474	$ (3,258)	$ 5,519
Comprehensive income	$ 65,129	$ 73,330	$ 57,297