Annual report pursuant to Section 13 and 15(d)

Supplementary Data - Quarterly Financial Data (Details)

v3.10.0.1
Supplementary Data - Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplementary Data - Quarterly Financial Data [Abstract]                      
Sales $ 57,307 $ 55,686 $ 45,881 $ 53,267 $ 52,677 $ 45,774 $ 30,680 $ 41,556 $ 212,141 $ 170,687 $ 148,189
Gross profit 20,418 19,857 15,860 17,827 17,188 15,284 9,038 12,300 73,962 53,810 43,684
Operating income (loss) 3,788 4,012 (123) 494 374 (1,049) (3,864) (276) 8,171 (4,815) (5,970)
Net income (loss) $ 3,548 $ 4,127 $ (777) $ 403 $ 6,019 $ (1,583) $ (3,654) $ (1,455) $ 7,301 $ (673) $ (8,978)
Earnings (loss) per share:                      
Basic net income (loss) per share $ 0.12 $ 0.14 $ (0.03) $ 0.01 $ 0.20 $ (0.05) $ (0.12) $ (0.05) $ 0.24 $ (0.02) $ (0.30)
Diluted net income (loss) per share $ 0.12 $ 0.14 $ (0.03) $ 0.01 $ 0.20 $ (0.05) $ (0.12) $ (0.05) $ 0.24 $ (0.02) $ (0.30)