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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Trade accounts receivable, allowances $ 8 $ 28
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Preferred stock, shares authorized (in shares) 5,000,000  
Preferred stock, shares issued 2,597,470 0
Preferred stock, shares outstanding 2,597,470 0
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, number of shares authorized 50,000,000 30,000,000
Common stock, number of shares issued 3,525,374 2,485,684 [1]
Common stock, number of shares outstanding 3,525,374 2,485,684
Convertible Preferred Stock    
Preferred stock, shares authorized (in shares) 3,300,000 2,000,000
[1]       *Shares outstanding for prior periods have been restated for the 1-for-5 reverse stock split effective June 11, 2020.