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Selected Quarterly Financial Information (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information                      
Net sales $ 138,946 $ 112,078 $ 98,637 $ 104,502 $ 113,202 $ 108,954 $ 97,822 $ 99,371 $ 454,163 $ 419,349 $ 542,082
Gross profit 56,845 49,142 41,894 46,419 44,970 42,223 36,285 34,716 194,300 158,194 193,719
Net income (loss) $ (102) $ 580 $ (8,302) $ (567) $ (32,871) $ (11,767) $ (15,565) $ (18,530) $ (8,391) $ (78,733) $ (407,088)
Basic income (loss) per common share (in dollars per share) $ 0.00 $ 0.01 $ (0.17) $ (0.01) $ (0.69) $ (0.25) $ (0.33) $ (0.40) $ (0.17) $ (1.66) $ (8.63)
Diluted earnings (loss) per share (in dollars per share) $ 0.00 $ 0.01 $ (0.17) $ (0.01) $ (0.69) $ (0.25) $ (0.33) $ (0.40) $ (0.17) $ (1.66) $ (8.63)