Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue from Contract with Customer, Including Assessed Tax	$ 105,568	$ 100,867	$ 89,151
Cost of sales	31,629	30,170	26,215
Gross profit	73,939	70,697	62,936
Sales and marketing	27,318	25,948	26,105
General and administrative	17,689	17,010	14,354
Research and development	8,197	6,636	6,141
Gain on divestitures and acquisitions	(7,474)
Total operating expenses	45,730	49,594	46,600
Income from operations	28,209	21,103	16,336
Other income (expense):
Interest income	631	179	81
Interest expense	(2)	(21)	(14)
Foreign currency loss	(394)	(155)	(161)
Income before income taxes	28,444	21,106	16,242
Provision for income taxes	5,501	3,929	5,652
Net income	$ 22,943	$ 17,177	$ 10,590
Earnings per share of common stock:
Basic (in dollars per share)	$ 1.18	$ 0.91	$ 0.57
Diluted (in dollars per share)	$ 1.13	$ 0.86	$ 0.55
Weighted-average shares outstanding:
Basic (in shares)	19,426	18,961	18,485
Diluted (in shares)	20,242	20,033	19,241
Cash dividends declared per common share (in dollars per share)	$ 0.28	$ 0.22	$ 0.18