Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenues	$ 66,010	$ 85,705	$ 156,714	$ 172,215
Cost of goods sold	40,162	41,132	92,864	83,558
Gross profit	25,848	44,573	63,850	88,657
Operating expenses
Sales and marketing	6,305	10,948	16,435	21,345
General and administrative	20,670	13,293	37,369	25,882
Research and development	4,418	5,795	8,466	10,724
Total operating expenses	31,393	30,036	62,270	57,951
Operating (loss) income	(5,545)	14,537	1,580	30,706
Interest expense	1,914	4,543	3,860	9,135
Loss on extinguishment of debt	0	3,196	0	3,196
Other income	(756)	(1,312)	(1,106)	(2,499)
(Loss) income before income taxes	(6,703)	8,110	(1,174)	20,874
Income tax expense	309	1,698	2,501	4,513
Net (loss) income	$ (7,012)	$ 6,412	$ (3,675)	$ 16,361
Net (loss) income per common share:
Basic (in dollars per share)	$ (0.16)	$ 0.16	$ (0.09)	$ 0.42
Diluted (in dollars per share)	$ (0.16)	$ 0.16	$ (0.09)	$ 0.41
Weighted-average common shares outstanding:
Basic (in shares)	43,135	38,972	41,284	38,789
Diluted (in shares)	43,135	40,239	41,284	40,064