Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue	$ 10,474	$ 21,684	$ 34,955	$ 42,462
Cost of revenue	3,240	8,672	12,243	18,198
Gross profit	7,234	13,012	22,712	24,264
Operating expenses:
Sales, general and administrative	14,438	18,394	33,422	34,450
Research and development	2,399	4,001	6,598	7,585
Total operating expenses	16,837	22,395	40,020	42,035
Loss from operations	(9,603)	(9,383)	(17,308)	(17,771)
Interest income	2	4	10	10
Interest expense	(2,130)	(2,521)	(4,276)	(4,763)
Change in fair value of derivative instruments	1,492	2,640	(437)	2,608
Change in fair value of contingent consideration	(141)	137	299	362
Other expense, net	103	118	(6,093)	(186)
Loss before income taxes	(10,277)	(9,005)	(27,805)	(19,740)
Provision for income taxes	(194)	(35)	(425)	(79)
Net loss	$ (10,471)	$ (9,040)	$ (28,230)	$ (19,819)
Basic and diluted net loss per share (in dollars per share)	$ (0.45)	$ (0.44)	$ (1.23)	$ (0.97)
Weighted average outstanding shares used for basic and diluted net loss per share (in shares)	23,482,031	20,448,643	22,969,162	20,407,912