Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data (Unaudited) - Summary of Company's Unaudited Quarterly Results (Detail)

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Quarterly Financial Data (Unaudited) - Summary of Company's Unaudited Quarterly Results (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Quarterly Financial Information [Line Items]                      
Net sales $ 22,301 $ 17,323 $ 22,798 $ 27,617 $ 37,455 $ 33,646 $ 35,566 $ 28,502 $ 90,039 $ 135,169 $ 102,218
Gross profit 4,559 3,524 7,135 8,037 12,785 10,103 10,984 7,932 23,255 41,804 31,812
Net income $ 520 $ 1,274 $ 1,976 $ 2,361 $ 4,165 $ 3,992 $ 4,186 $ 2,392 $ 6,131 $ 14,735 $ 10,145
Per share:                      
Basic income per share $ 0.05 $ 0.13 $ 0.20 $ 0.23 $ 0.41 $ 0.39 $ 0.41 $ 0.24 $ 0.61 $ 1.46 $ 1.01
Diluted income per share 0.05 0.13 0.20 0.23 0.41 0.39 0.41 0.24 0.61 1.45 $ 1.00
Minimum [Member]                      
Per share:                      
Market price range of common stock 14.39 15.63 15.71 19.82 20.58 26.06 27.99 26.20 14.39 20.58  
Maximum [Member]                      
Per share:                      
Market price range of common stock $ 20.24 $ 18.88 $ 20.60 $ 25.25 $ 28.86 $ 34.65 $ 35.35 $ 34.88 $ 25.25 $ 35.35