Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenue	$ 22,758	$ 22,854	$ 57,713	$ 65,316
Cost of revenue	7,612	8,616	19,855	26,814
Gross profit	15,146	14,238	37,858	38,502
Operating expenses:
Sales, general and administrative	15,008	19,227	48,430	53,677
Research and development	2,729	3,776	9,327	11,361
Total operating expenses	17,737	23,003	57,757	65,038
Loss from operations	(2,591)	(8,765)	(19,899)	(26,536)
Interest income	2	3	12	13
Interest expense	(2,886)	(1,805)	(7,162)	(6,568)
Change in fair value of derivative instruments	879	235	442	2,843
Change in fair value of contingent consideration	5	205	304	567
Other income (expense), net	525	(2,340)	(5,568)	(2,526)
Loss before income taxes	(4,066)	(12,467)	(31,871)	(32,207)
Provision for income taxes	(181)	(308)	(606)	(387)
Net loss	$ (4,247)	$ (12,775)	$ (32,477)	$ (32,594)
Basic and diluted net loss per share (in dollars per share)	$ (0.18)	$ (0.62)	$ (1.40)	$ (1.59)
Weighted average outstanding shares used for basic and diluted net loss per share (in shares)	23,611,925	20,620,828	23,184,322	20,478,603