Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Revenue	$ 35,095	$ 15,177
Cost of revenue	20,408	11,119
Gross profit	14,687	4,058
Operating expenses	34,701	17,684
Operating loss	(20,014)	(13,626)
Other income (expense)	(2,538)	40
Interest expense	(3,047)	(570)
Change in fair value of warrant liability	(60)	(56)
Net loss	$ (25,659)	$ (14,212)
Net loss per share, basic and diluted (in dollars per share)	$ (1.56)	$ (0.89)
Weighted-average shares used to compute basic and diluted net loss per share (in shares)	16,418	15,955