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Warrants - Additional Information (Details)
1 Months Ended 3 Months Ended 12 Months Ended
May 05, 2020
USD ($)
$ / shares
shares
Feb. 22, 2019
USD ($)
$ / shares
shares
Feb. 15, 2019
shares
Mar. 06, 2017
$ / shares
shares
Feb. 28, 2019
USD ($)
Jun. 30, 2020
shares
Mar. 31, 2019
shares
Dec. 31, 2019
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Right Offering [Member]                  
Class Of Warrant Or Right [Line Items]                  
Number of shares issued upon right offering | shares   5,976,000   1,706,000          
Share price (in dollars per share)   $ 5.792   $ 11.76          
Proceeds from issuance or sale of equity, total | $   $ 34,400,000     $ 34,400,000        
Exercise price of exercisable warrant   $ 11.76              
Underwriter warrants price per share   11.76              
Additional share price (in dollars per share)   $ 11.76   $ 11.76          
Term of warrants   5 years   5 years          
Warrants to purchase shares of common stock | shares                 632
Underwriter?s Warrants [Member]                  
Class Of Warrant Or Right [Line Items]                  
Percentage of underwriting fee and reimbursable expenses 8.50%                
Underwriting fee and reimbursable expenses | $ $ 90,000                
Other expenses | $ 100,000                
Cash consideration | $ $ 100                
Purchase of common stock by underwriter granted | shares 375,000                
Exercise price of exercisable warrant $ 1.25                
Warrants expiration date Apr. 30, 2020                
Underwriter warrants price per share $ 1.25                
Warrant [Member]                  
Class Of Warrant Or Right [Line Items]                  
Exercise price of exercisable warrant $ 0.75             $ 11.76 $ 11.27
Issuance of shares of common stock and warrants in connection with rights offering, net of issuance costs (in shares) | shares 280,000                
Underwriter warrants price per share $ 0.75             $ 11.76 $ 11.27
Warrants exercisable, intrinsic value | $                 $ 0
Warrant [Member] | Expected Lives [Member]                  
Class Of Warrant Or Right [Line Items]                  
Alternative investment, measurement input 5 years                
Warrant [Member] | Risk Free Interest Rate [Member]                  
Class Of Warrant Or Right [Line Items]                  
Alternative investment, measurement input 94.0                
Warrant [Member] | Expected Volatility [Member]                  
Class Of Warrant Or Right [Line Items]                  
Alternative investment, measurement input 0.67                
Warrant [Member] | Dividend Yield [Member]                  
Class Of Warrant Or Right [Line Items]                  
Alternative investment, measurement input 0.0                
March 2017 Warrants [Member]                  
Class Of Warrant Or Right [Line Items]                  
Number of warrants issued | shares     1.7            
Adjustment to additional paid-in capital and accumulated deficit | $               $ 1,600,000  
March 2017 Warrants [Member] | Right Offering [Member]                  
Class Of Warrant Or Right [Line Items]                  
Term of warrants     2 years            
March 2017 Warrants Before Extension [Member] | Expected Lives [Member]                  
Class Of Warrant Or Right [Line Items]                  
Alternative investment, measurement input     3 years 29 days            
March 2017 Warrants Before Extension [Member] | Risk Free Interest Rate [Member]                  
Class Of Warrant Or Right [Line Items]                  
Alternative investment, measurement input     2.50            
March 2017 Warrants Before Extension [Member] | Expected Volatility [Member]                  
Class Of Warrant Or Right [Line Items]                  
Alternative investment, measurement input     81            
March 2017 Warrants Before Extension [Member] | Dividend Yield [Member]                  
Class Of Warrant Or Right [Line Items]                  
Alternative investment, measurement input     0.00            
March 2017 Warrants After Extension [Member] | Expected Lives [Member]                  
Class Of Warrant Or Right [Line Items]                  
Alternative investment, measurement input     5 years 29 days            
March 2017 Warrants After Extension [Member] | Risk Free Interest Rate [Member]                  
Class Of Warrant Or Right [Line Items]                  
Alternative investment, measurement input     2.49            
March 2017 Warrants After Extension [Member] | Expected Volatility [Member]                  
Class Of Warrant Or Right [Line Items]                  
Alternative investment, measurement input     82            
March 2017 Warrants After Extension [Member] | Dividend Yield [Member]                  
Class Of Warrant Or Right [Line Items]                  
Alternative investment, measurement input     0.00            
Common Stock [Member]                  
Class Of Warrant Or Right [Line Items]                  
Number of shares issued upon right offering | shares 7,500,000                
Share price (in dollars per share) $ 1.00                
Proceeds from issuance or sale of equity, total | $ $ 6,700,000                
Issuance of shares of common stock and warrants in connection with rights offering, net of issuance costs (in shares) | shares           7,500,000 5,976,000