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)

v3.20.2
Offerings of Common Stock and Warrants and At-the-Market Offering Program - At-the-Market Offerings (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 16, 2020
Jun. 15, 2020
Dec. 09, 2019
Dec. 08, 2019
Sep. 04, 2019
Dec. 31, 2019
Jun. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
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         $ 1,392,000 $ 6,041,000    
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 $ 4,815,000 $ 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                   $ 10,800,000      
Common stock sold (in shares)                   782,448      
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