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Equity - Common Stock and Preferred Stock (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2020
Aug. 24, 2020
Sep. 30, 2020
Aug. 31, 2020
Jul. 31, 2018
Dec. 31, 2021
Dec. 31, 2020
Stockholders' equity              
Common stock, authorized shares           62,500  
Preferred stock, authorized shares           2,000  
Number of shares of common stock issued             3,242
Shares Issued, Price Per Share             $ 2.00
Net proceeds from the offering $ 1,300 $ 4,800          
Net proceeds from the offering           $ 5,309 $ 6,053
Public offering              
Stockholders' equity              
Number of shares of common stock issued       2,600      
Shares Issued, Price Per Share       $ 2.00      
Net proceeds from the offering       $ 4,800      
Private offering              
Stockholders' equity              
Number of shares of common stock issued     654        
Shares Issued, Price Per Share $ 2.00   $ 2.00        
Net proceeds from the offering     $ 1,300        
ATM              
Stockholders' equity              
Number of shares of common stock issued           1,100  
Shares Issued, Price Per Share           $ 5.03  
Aggregate offering price           $ 15,000  
Gross proceeds from the offering           5,500  
Net proceeds from the offering           $ 5,300  
Participation Right              
Stockholders' equity              
Stock Issued, Investor, Maximum Voting Power Percentage         20.00%    
Stock Issued, Investor, Maximum Beneficial Ownership Percentage         20.00%