Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 24,481	$ 20,778
Cost of revenue	9,003	9,526
Gross profit	15,478	11,252
Operating expenses:
Sales, general and administrative	18,984	16,056
Research and development	4,199	3,584
Total operating expenses	23,183	19,640
Loss from operations	(7,705)	(8,388)
Interest income	8	6
Interest expense	(2,146)	(2,242)
Change in fair value of derivative instruments	(1,929)	(32)
Change in fair value of contingent consideration	440	225
Other expense, net	(6,196)	(304)
Loss before income taxes	(17,528)	(10,735)
Provision for income taxes	(231)	(44)
Net loss	$ (17,759)	$ (10,779)
Basic and diluted net loss per share (in dollars per share)	$ (0.79)	$ (0.53)
Weighted average outstanding shares used for basic and diluted net loss per share (in shares)	22,456,365	20,495,671