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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

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