Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statements of Operations:
Revenue	$ 113,452	$ 107,745
Cost of revenue	54,592	49,837
Gross profit	58,860	57,908
Operating expenses
Marketing and sales	18,577	16,572
Research and development	8,013	6,665
General and administrative	12,822	12,943
Total operating expenses	39,412	36,180
Income from operations	19,448	21,728
Other income, net	213	178
Income before income taxes	19,661	21,906
Provision for income taxes	4,150	3,855
Net income	$ 15,511	$ 18,051
Net income per share:
Basic (in dollars per share)	$ 0.58	$ 0.67
Diluted (in dollars per share)	$ 0.57	$ 0.66
Shares used to compute net income per share:
Basic (in shares)	26,963,366	26,879,388
Diluted (in shares)	27,177,039	27,197,099
Comprehensive Income (net of tax)
Comprehensive income	$ 15,987	$ 20,444