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Quarterly Results of Operations (unaudited) - Schedule of Quarterly Results of Operations (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 50,889 $ 60,027 $ 65,393 $ 65,135 $ 62,426 $ 52,633 $ 47,654 $ 38,823 $ 241,443 $ 201,537 $ 155,047
Gross profit 33,648 36,272 38,498 37,674 35,354 35,595 31,021 25,796 146,092 127,766 99,871
Operating expenses 28,480 22,817 22,745 21,597 22,645 21,753 23,375 21,905 95,639 89,678 86,159
Operating income 5,168 13,455 15,753 16,077 12,709 13,842 7,646 3,891 50,453 38,088 13,712
Income from Continuing Operations 3,485 11,186 13,866 13,657 10,983 11,209 6,893 3,526 42,194 32,611 10,967
Income (loss) from Discontinued Operations (1) (4) (14) (23) 941 (46) (7) (16) (43) 873 180
Net income $ 3,484 $ 11,182 $ 13,852 $ 13,634 $ 11,924 $ 11,163 $ 6,886 $ 3,510 $ 42,151 $ 33,484 $ 11,147
Basic income/(loss) per share:                      
Continuing operations $ 0.09 $ 0.28 $ 0.35 $ 0.34 $ 0.28 $ 0.28 $ 0.18 $ 0.09 $ 1.07 $ 0.83 $ 0.28
Discontinued operations 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.00 0.00 0.02 0.00
Total net income per share 0.09 0.28 0.35 0.34 0.30 0.28 0.18 0.09 1.07 0.85 0.28
Diluted income/(loss) per share:                      
Continuing operations 0.09 0.28 0.35 0.34 0.28 0.28 0.17 0.09 1.06 0.83 0.28
Discontinued Operations 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.00 0.00 0.02 0.00
Total Net income per share $ 0.09 $ 0.28 $ 0.35 $ 0.34 $ 0.30 $ 0.28 $ 0.17 $ 0.09 $ 1.06 $ 0.85 $ 0.28