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Equity - Common Stock and Preferred Stock (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Jul. 31, 2018
Mar. 31, 2022
Mar. 31, 2021
Stockholders' equity      
Common stock, authorized shares   62,500  
Preferred stock, authorized shares   2,000  
Net proceeds from the offering   $ 578 $ 3,393
ATM      
Stockholders' equity      
Number of shares of common stock issued   496  
Aggregate offering price   $ 15,000  
Net proceeds from the offering   $ 614  
Share price of shares issued in offering (in dollars per share)   $ 1.24  
Participation Right      
Stockholders' equity      
Stock Issued, Investor, Maximum Voting Power Percentage 20.00%    
Stock Issued, Investor, Maximum Beneficial Ownership Percentage 20.00%    
Common Stock | ATM      
Stockholders' equity      
Number of shares of common stock issued   1,600  
Gross proceeds from the offering   $ 6,100  
Net proceeds from the offering   $ 5,900  
Share price of shares issued in offering (in dollars per share)   $ 3.85