Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenues	$ 90,704	$ 86,510
Cost of goods sold	52,702	42,426
Gross profit	38,002	44,084
Operating expenses
Sales and marketing	10,130	10,397
General and administrative	16,699	12,589
Research and development	4,048	4,929
Total operating expenses	30,877	27,915
Operating income	7,125	16,169
Interest expense	1,946	4,592
Other income	(350)	(1,187)
Income before income taxes	5,529	12,764
Income tax expense	2,192	2,815
Net income	$ 3,337	$ 9,949
Net income per common share:
Basic (in dollars per share)	$ 0.08	$ 0.26
Diluted (in dollars per share)	$ 0.08	$ 0.25
Weighted-average common shares outstanding:
Basic (in shares)	39,433	38,603
Diluted (in shares)	40,102	39,787