Quarterly Results (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenue, net	$ 15,967	$ 18,466	$ 18,341	$ 13,122	$ 16,777	$ 18,294	$ 16,249	$ 14,545	$ 65,896	$ 65,865
Gross profit	1,940	7,280	8,541	5,762	5,662	6,719	4,784	5,220	23,523	22,385
Operating loss	(6,175)	209	686	(2,740)	(5,445)	(1,213)	(4,910)	(3,531)	(8,020)	(15,099)
Net loss	(5,298)	(7,113)	(3,989)	(8,724)	(14,390)	(3,945)	(13,119)	(4,802)	(25,124)	(36,256)
Net income (loss) attributable to common stockholders	$ (5,298)	$ (7,113)	$ (3,989)	$ (8,724)	$ (14,390)	$ (3,945)	$ (13,119)	$ (4,802)	$ (25,124)	$ (36,256)
Basic loss per share (in dollars per share)	$ (0.10)	$ (0.13)	$ (0.08)	$ (0.16)	$ (0.27)	$ (0.07)	$ (0.25)	$ (0.09)	$ (0.47)	$ (0.68)
Diluted loss per share (in dollars per share)	$ (0.10)	$ (0.13)	$ (0.08)	$ (0.16)	$ (0.27)	$ (0.07)	$ (0.25)	$ (0.09)	$ (0.47)	$ (0.68)