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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Convertible Subordinated Debt, Discount $ 12,700 $ 3,700
Note payable, discount $ 50 $ 0
Preferred stock, par value per share (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized 2,500,000 2,500,000
Common stock, par value per share (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 49,616,154 49,616,154
Common stock, shares outstanding 39,837,058 39,837,058
Allowance for doubtful accounts receivable $ 1,200 $ 1,100
Class A convertible preferred stock [Member]    
Preferred stock, shares authorized 800,000  
Common stock, par value per share (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 800,000 800,000
Common stock, shares issued 0 0
Common stock, shares outstanding 0 0
Class B convertible preferred stock [Member]    
Preferred stock, shares authorized 585,000  
Common stock, par value per share (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 585,000 585,000
Common stock, shares issued 0 0
Common stock, shares outstanding 0 0
Class C convertible preferred stock    
Preferred stock, shares authorized 250,000  
Common stock, par value per share (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 250,000 250,000
Common stock, shares issued 200,000 200,000
Common stock, shares outstanding 200,000 200,000