CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Revenues	$ 7,739	$ 15,333
Cost of revenues (exclusive of depreciation and amortization)	5,021	7,280
Gross profit	2,718	8,053
Operating expenses:
Research and development	2,913	3,711
Sales and marketing	2,195	3,392
General and administrative	6,363	6,724
Impairment charges	305	1,150
Depreciation and amortization	2,736	3,140
Total operating expenses	14,512	18,117
Loss from operations	(11,794)	(10,064)
Interest and other (income) expense:
Interest expense and other, net	22	352
Gain on extinguishment of debt	(2,448)	(3,117)
Other income	(227)	0
Foreign exchange loss	0	19
Interest and other (income) expense, net	(2,653)	(2,746)
Loss before income taxes	(9,141)	(7,318)
Income tax (benefit) expense	(90)	103
Net loss	(9,051)	(7,421)
Preferred stock dividends	1	17
Undeclared dividends	366	788
Less: conversion inducement	300	0
Warrant modification	37	0
Net loss attributable to common stockholders	$ (9,755)	$ (8,226)
Net loss attributable to common stockholders per share:
Basic net loss per share (in dollars per share)	$ (0.37)	$ (1.48)
Diluted net loss per share (in dollars per share)	$ (0.37)	$ (1.48)
Weighted-average number of common shares:
Basic (in shares)	26,567	5,547
Diluted (in shares)	26,567	5,547