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Quarterly financial summary (unaudited) - Schedule of Unaudited Quarterly Results (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
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 78,571	$ 63,889	$ 59,055	$ 65,920	$ 81,593	$ 71,865	$ 55,856	$ 60,574	$ 267,435	$ 269,888	$ 229,567
Gross profit	46,919	38,969	36,645	40,208	47,694	42,913	35,890	38,228	162,741	164,725	132,235
Net income	$ 9,672	$ 3,915	$ 1,248	$ 690	$ 21,480	$ 5,865	$ 3,970	$ 2,160	$ 15,525	$ 33,475	$ 5,313
Net income (loss) per share:
Basic (in USD per share)	$ 0.20	$ 0.08	$ 0.03	$ 0.01	$ 0.47	$ 0.13	$ 0.09	$ 0.05	$ 0.33	$ 0.74	$ (39.47)
Diluted (in USD per share)	$ 0.20	$ 0.08	$ 0.03	$ 0.01	0.44	$ 0.12	$ 0.08	$ 0.04	$ 0.32	$ 0.68	$ (39.47)
Impact of Tax Act, basic (in USD per share)					0.25
Impact of Tax Act, diluted (in USD per share)					$ 0.23

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