Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Trade accounts receivable, allowances	$ 14	$ 8
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued	876,447	2,597,470
Preferred stock, shares outstanding	876,447	2,597,470
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued	6,368,549	3,525,374	[1]
Common stock, shares outstanding	6,368,549	3,525,374
Convertible Preferred Stock
Preferred stock authorized (in shares)	3,300,000	3,300,000

[1]       *Shares outstanding for prior periods have been restated for the 1-for-5 reverse stock split effective June 11, 2020.