Quarterly report pursuant to Section 13 or 15(d)

Warrants - Narrative (Details)

v3.20.1
Warrants - Narrative (Details) - USD ($)
3 Months Ended
Feb. 10, 2020
Mar. 31, 2020
Mar. 31, 2019
Feb. 29, 2020
Warrants in Connection with February 2020 Stock Offering        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares purchased from issuance of warrants (in shares) 5,625,000     5,625,000
Warrants, initial exercise period from time of issuance 6 months      
Exercise price for shares purchased from issuance of warrants (in dollars per share) $ 1.05      
Warrant term 5 years      
Oppenheimer & Co., Underwriter Warrant        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares purchased from issuance of warrants (in shares) 525,000      
Exercise price for shares purchased from issuance of warrants (in dollars per share) $ 1.05      
Equity Classified Warrants | Warrant        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense   $ 0 $ 2,000  
Unrecognized stock compensation expense related to equity-classified warrants   $ 0