Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Information (unaudited) - Summary of Quarterly Results of Operations (Detail)

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Quarterly Financial Information (unaudited) - Summary of Quarterly Results of Operations (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Sales $ 13,028 $ 13,142 $ 14,462 $ 15,107 $ 16,562 $ 15,787 $ 14,972 $ 13,305 $ 55,739 $ 60,625 $ 49,521
Gross profit 5,779 6,075 6,685 6,785 6,850 6,865 6,602 6,194 25,324 26,511 23,302
Total operating expenses 5,868 6,280 6,189 6,607 5,730 6,558 10,251 7,358 24,944 29,897 22,333
Net income (loss) $ 63 $ (135) $ 662 $ 336 $ 1,275 $ 437 $ (3,190) $ (1,106) $ 926 $ (2,584) $ 1,141
Basic net income (loss) per share $ 0.01 $ (0.01) $ 0.07 $ 0.03 $ 0.13 $ 0.05 $ (0.34) $ (0.12) $ 0.10 $ (0.27) $ 0.12
Diluted net income (loss) per share $ 0.01 $ (0.01) $ 0.07 $ 0.03 $ 0.13 $ 0.04 $ (0.34) $ (0.12) $ 0.09 $ (0.27) $ 0.11