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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Revenue, net	$ 9,638	$ 8,190	$ 9,253	$ 13,774	$ 16,023	$ 18,057	$ 18,027	$ 16,648	$ 40,855	$ 68,755
Gross profit	4,385	3,976	5,049	6,775	7,300	9,347	9,376	8,472	20,185	34,495
Loss from operations	(6,901)	(8,137)	(6,421)	(5,277)	(4,898)	(2,444)	(2,321)	(3,460)	(26,736)	(13,123)
Loss before income taxes	(6,098)	(8,165)	(6,445)	(5,223)	(4,574)	(2,374)	(2,217)	541	(25,931)	(8,624)
Net loss	$ (6,439)	$ (8,139)	$ (6,552)	$ (5,399)	$ (4,456)	$ (2,306)	$ (2,448)	$ 133	(26,529)	$ (9,077)
Net loss per share:
Basic (in dollars per share)	$ (0.15)	$ (0.20)	$ (0.17)	$ (0.14)	$ (0.12)	$ (0.06)	$ (0.06)	$ 0.00
Diluted (in dollars per share)					$ (0.12)	$ (0.06)	$ (0.06)	$ 0.00
Restructuring charges									$ 2,214

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