Quarterly report pursuant to Section 13 or 15(d)

Offerings of Common Stock and Warrants and At-the-Market Offering Program - At-the-Market Offerings (Details)

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Offerings of Common Stock and Warrants and At-the-Market Offering Program - At-the-Market Offerings (Details) - USD ($)
 1 Months Ended 3 Months Ended
Jun. 16, 2020
Jun. 15, 2020
Dec. 09, 2019
Dec. 08, 2019
Sep. 04, 2019
Dec. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Jul. 15, 2020
Mar. 31, 2020
Jun. 07, 2018
At-the-Market Offering Program                      
Initial exercise price (in dollars per share)             $ 6.12        
Common stock, par value (in dollars per share)             $ 0.001     $ 0.001  
Warrants, aggregate shares         440,000            
Net proceeds from offering of common stock and warrants         $ 4,600,000   $ 1,376,000 $ 1,223,000      
Decrease the exercise price $ 2.61 $ 3.80 $ 3.80 $ 8.86              
Additional debt discount           $ 300,000          
Exercise price of common stock (in dollars per share)             $ 1.18        
Issuance of warrants (in shares)             765,000        
Aggregate offering price of common stock             $ 1,372,000 $ 1,222,000      
Aggregate registered direct offering (in shares)         580,000            
Aggregate registered direct offering par value (in dollars per share)         $ 0.001            
Negotiated purchase price of common stock         5.00            
Negotiated purchase price of pre-funded warrant         $ 5.00            
Proceeds from issuance of warrants         $ 5,100,000            
Common warrants period             5 years        
Percentage of common stock             75.00%        
June 2018 Sales Agreement                      
At-the-Market Offering Program                      
Aggregate offering price for at-the-market offering program                 $ 2,800,000    
Common stock sold (in shares)             800,000        
Net proceeds from sale of the common stock, after deducting fees and other offering expenses (in dollars)             $ 1,400,000        
Common stock commissions paid             $ 51,000        
June 2018 Sales Agreement | Maximum                      
At-the-Market Offering Program                      
Aggregate offering price for at-the-market offering program                     $ 25,000,000