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Equity - Common Stock and Preferred Stock (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Stockholders' equity    
Common stock, authorized shares 62,500,000  
Preferred stock, authorized shares 2,000,000  
Net proceeds from the offering $ 3,393,000 $ 0
Public offering    
Stockholders' equity    
Number of shares of common stock issued 940,748  
Shares Issued, Price Per Share $ 4.93  
Common Stock    
Stockholders' equity    
Number of shares of common stock issued 1,250  
Common Stock | ATM    
Stockholders' equity    
Common stock, authorized shares 15,000,000  
Number of shares of common stock issued 940,748  
Shares Issued, Price Per Share $ 4.93  
Net proceeds from the offering $ 4,500,000  
Gross proceeds from the offering $ 4,600,000  
Number of shares issued not yet settled 190,748  
Net proceeds for issuance of shares issued but not yet settled $ 1,100,000