Quarterly report pursuant to Section 13 or 15(d)

Convertible Preferred Stock and Stockholders' Equity - Alexander settlement agreement (Details)

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Convertible Preferred Stock and Stockholders' Equity - Alexander settlement agreement (Details) - USD ($)
 3 Months Ended
Nov. 09, 2020
May 18, 2020
May 14, 2020
Mar. 31, 2020
Class of Stock [Line Items]        
Issuance of common stock and warrants, net of offering costs (in shares) 236,375 60,250    
Value of common stock issued       $ 725,000
Vendors        
Class of Stock [Line Items]        
Issuance of common stock and warrants, net of offering costs (in shares)   10,250    
Alexander Settlement Agreement        
Class of Stock [Line Items]        
Cash fees paid     $ 125,000  
Issuance of common stock and warrants, net of offering costs (in shares)   50,000 50,000  
Value of common stock issued     $ 111,000