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Quarterly financial summary - Schedule of Unaudited Quarterly Results (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                                
Net sales $ 92,671 $ 88,562 $ 72,350 $ 64,527 $ 74,712 $ 80,760 $ 67,615 $ 59,764 $ 66,141 $ 78,571 $ 63,889 $ 59,055 $ 65,920 $ 318,110 $ 282,851 $ 267,435
Gross profit 58,600 57,119 47,138 43,341 48,064 52,520 43,348 37,191 40,491 46,919 38,969 36,645 40,208 206,198 181,123 162,741
Net income (loss) $ (24) $ 4,297 $ 447 $ 1,512 $ (341) $ 8,002 $ 6,517 $ 3,706 $ (17,914) $ 9,672 $ 3,915 $ 1,248 $ 690 $ 6,232 $ 17,884 $ 15,525
Net income (loss) per share:                                
Basic (in USD per share) $ (0.00) $ 0.09 $ 0.01 $ 0.03 $ (0.01) $ 0.16 $ 0.13 $ 0.08 $ (0.37) $ 0.20 $ 0.08 $ 0.03 $ 0.01 $ 0.13 $ 0.37 $ 0.33
Diluted (in USD per share) $ (0.00) $ 0.08 $ 0.01 $ 0.03 $ (0.01) $ 0.16 $ 0.13 $ 0.07 $ (0.37) $ 0.20 $ 0.08 $ 0.03 $ 0.01 $ 0.12 $ 0.35 $ 0.32