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, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Quarterly Financial Information [Line Items]                      
Net sales $ 23,082 $ 25,286 $ 21,643 $ 20,593 $ 23,641 $ 17,198 $ 21,441 $ 29,551 $ 90,604 $ 91,831 $ 77,534
Gross profit 4,442 4,044 4,948 4,714 4,798 3,742 6,227 7,142 18,148 21,909 16,975
Net income (loss) $ 576 $ 9 $ 1,205 $ 82 $ (4,553) $ 95 $ 1,827 $ 2,323 $ 1,872 $ (308) $ (9,844)
Per share:                      
Basic $ 0.06   $ 0.12 $ 0.01 $ (0.46) $ 0.01 $ 0.19 $ 0.24 $ 0.19 $ (0.03) $ (1.01)
Diluted 0.06   0.12 0.01 (0.46) 0.01 0.19 0.24 0.19 (0.03) $ (1.01)
Minimum [Member]                      
Per share:                      
Market price range of common stock 11.07 $ 19.03 17.70 18.96 19.00 19.48 22.55 20.75 11.07 19.00  
Maximum [Member]                      
Per share:                      
Market price range of common stock $ 21.90 $ 23.77 $ 23.25 $ 22.84 $ 24.90 $ 28.73 $ 28.98 $ 27.51 $ 23.77 $ 28.98