Quarterly report pursuant to Section 13 or 15(d)

Convertible Preferred Stock and Stockholders' Equity - securities purchase agreement (Details)

v3.20.2
Convertible Preferred Stock and Stockholders' Equity - securities purchase agreement (Details) - USD ($)
Jun. 09, 2020
Jun. 04, 2020
May 18, 2020
Feb. 06, 2020
Apr. 18, 2019
Class of Stock [Line Items]          
Issuance of common stock, net of shelf offering costs (in shares)     60,250    
Warrant to purchase shares       4,553 12,756
Securities Purchase Agreement          
Class of Stock [Line Items]          
Issuance of common stock, net of shelf offering costs (in shares) 2,040,000 2,275,000      
warrant term 5 years 6 months 5 years 6 months      
Warrant to purchase shares 2,040,000 2,275,000      
Exercise price of warrants $ 2.61 $ 2.55      
Gross proceeds from offering $ 5,324,000 $ 5,801,000      
Cash fees paid $ 426,000 $ 464,000      
Cash fees paid percentage 8.00% 8.00%