Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
NET SALES	$ 69,877	$ 64,429	$ 57,342	$ 53,367	$ 51,835	$ 49,015	$ 45,679	$ 40,767	$ 245,015	$ 187,296	$ 118,223
GROSS MARGIN	60,807	56,432	49,948	45,421	46,849	44,036	40,590	35,619	212,608	167,094	105,558
NET INCOME	$ 5,481	$ 3,321	$ 1,975	$ 1,197	$ 13,378	$ 6,551	$ 5,430	$ 4,087	$ 11,974	$ 29,446	$ 6,220
Net income per common share - basic (in dollars per share)	$ 0.05	$ 0.03	$ 0.02	$ 0.01	$ 0.13	$ 0.06	$ 0.05	$ 0.04	$ 0.11	$ 0.28	$ 0.06
Net income per common share - diluted (in dollars per share)	$ 0.05	$ 0.03	$ 0.02	$ 0.01	$ 0.11	$ 0.06	$ 0.05	$ 0.04	$ 0.11	$ 0.26	$ 0.05