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Stockholders' Equity - Equity Issuances (Details) - USD ($)
 1 Months Ended 9 Months Ended 32 Months Ended
Jul. 10, 2020
May 31, 2020
Apr. 30, 2020
Mar. 31, 2019
Feb. 28, 2018
Sep. 30, 2020
Sep. 30, 2020
Jun. 30, 2019
Aug. 31, 2018
Class of Stock [Line Items]                  
Aggregate market of common stock held by non-affiliates               $ 52,800,000  
Lincoln Park Agreement                  
Class of Stock [Line Items]                  
Aggregate offering amount authorized per agreement               $ 26,000,000.0  
Commitment shares issued as consideration per agreement (in shares)       181,510          
Number of shares sold (in shares)       250,000          
Price of shares sold (in dollars per share)               $ 4.00  
Gross price for stock transaction       $ 1,000,000.0          
Term of agreement (in months)       36 months          
Number of shares allowable to direct for Regular Purchase (in shares)               100,000  
Maximum obligation per directed purchase transaction for Regular Purchase               $ 2,500,000  
Maximum shares allowed in Accelerated Purchase as percent of shares In Regular Purchase (percent)               300.00%  
Maximum shares allowed in Accelerated Purchase as percent of shares traded during specified period (percent)               30.00%  
Maximum beneficial ownership allowable per agreement (percent)               9.99%  
H.C. Wainwright Sales Amended Agreement                  
Class of Stock [Line Items]                  
Aggregate offering amount authorized per agreement               $ 17,600,000 $ 25,000,000.0
Commission on gross proceeds due to third party (percent)         3.00%        
Stock issued (shares)           3,558,778 3,784,912    
Proceeds from issuance of stock           $ 8,500,000 $ 9,500,000    
April Purchase Agreement                  
Class of Stock [Line Items]                  
Number of shares sold (in shares)     2,162,166            
Price of shares sold (in dollars per share)     $ 2.3125            
Proceeds from issuance of stock     $ 5,000,000.0            
Number of shares called by warrants issued     1,081,083            
Warrant exercise price (in dollars per share)     $ 2.2500            
Warrants expiration term     5 years 6 months            
May Purchase Agreement                  
Class of Stock [Line Items]                  
Number of shares sold (in shares)   2,084,850              
Price of shares sold (in dollars per share)   $ 2.0625              
Proceeds from issuance of stock   $ 4,300,000              
Number of shares called by warrants issued   1,042,425              
Warrant exercise price (in dollars per share)   $ 2.0625              
Warrants expiration term   5 years 6 months              
July Purchase Agreement                  
Class of Stock [Line Items]                  
Number of shares sold (in shares) 969,694                
Price of shares sold (in dollars per share) $ 2.0625                
Proceeds from issuance of stock $ 2,000,000.0                
Number of shares called by warrants issued 484,847                
Warrant exercise price (in dollars per share) $ 2.0625