Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenues	$ 88,544	$ 85,776	$ 245,258	$ 257,991
Cost of goods sold	52,284	44,187	145,148	127,745
Gross profit	36,260	41,589	100,110	130,246
Operating expenses
Sales and marketing	11,609	10,151	28,044	31,496
General and administrative	18,217	18,061	55,586	43,943
Research and development	11,684	4,860	20,150	15,584
Total operating expenses	41,510	33,072	103,780	91,023
Operating (loss) income	(5,250)	8,517	(3,670)	39,223
Interest expense	2,808	2,356	6,668	11,491
Loss on extinguishment of debt	0	0	0	3,196
Other (income) loss	(596)	804	(1,702)	(1,695)
(Loss) income before income taxes	(7,462)	5,357	(8,636)	26,231
Income tax (benefit) expense	(1,076)	501	1,425	5,014
Net (loss) income	$ (6,386)	$ 4,856	$ (10,061)	$ 21,217
Net (loss) income per common share:
Basic (in dollars per share)	$ (0.10)	$ 0.12	$ (0.20)	$ 0.55
Diluted (in dollars per share)	$ (0.10)	$ 0.12	$ (0.20)	$ 0.53
Weighted-average common shares outstanding:
Basic (in shares)	66,820	39,123	49,858	38,901
Diluted (in shares)	66,820	40,286	49,858	40,123