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Stockholders' Equity - Warrants (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Jul. 25, 2018
Jul. 17, 2018
Apr. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Class Of Stock [Line Items]                    
Warrant exercise price (in dollars per share)       $ 2.25       $ 2.25    
Warrant liability       $ 83,000       $ 83,000   $ 6,929,000
Change in fair value of warrants       81,000 $ 561,000     (2,342,000) $ 69,000  
Outstanding Warrants [Member]                    
Class Of Stock [Line Items]                    
Warrant liability       $ 4,500,000       4,500,000    
Change in fair value of warrants               $ 700,000    
Series U Warrants [Member]                    
Class Of Stock [Line Items]                    
Common stock issued (in shares)               3,450,000    
Sale of Stock, Price Per Share       $ 5.00       $ 5.00    
Warrants expected term       5 years       5 years    
Representative Warrants [Member]                    
Class Of Stock [Line Items]                    
Number of shares callable by warrants (in shares)       75,000       75,000    
Warrant exercise price (in dollars per share)       $ 6.25       $ 6.25    
Warrant exercise price decrease               $ 2.81    
Common Stock [Member]                    
Class Of Stock [Line Items]                    
Common stock issued (in shares)           5,000,000 139,855,000      
Warrants expected term       5 years       5 years    
Series C Convertible Preferred Stock [Member]                    
Class Of Stock [Line Items]                    
Conversion Price Per Share     $ 3.2132              
Preferred stock conversion price reduced (in dollars per share)     $ 2.25              
Common Class A                    
Class Of Stock [Line Items]                    
Common stock issued (in shares)               289,000    
Common Class B                    
Class Of Stock [Line Items]                    
Number of shares callable by warrants (in shares)       2,711,000       2,711,000    
2018 Rights Offering [Member]                    
Class Of Stock [Line Items]                    
Number of shares callable by warrants (in shares)   1                
Common stock issued (in shares) 6,723                  
Gross proceeds from private placement of stock $ 5,700,000                  
2018 Rights Offering [Member] | Outstanding Warrants [Member]                    
Class Of Stock [Line Items]                    
Number of shares callable by warrants (in shares)   1,050                
2018 Rights Offering [Member] | Common Stock and Series B Convertible Preferred Stock [Member]                    
Class Of Stock [Line Items]                    
Charge on Non Transferable Subscription Rights   $ 0                
2018 Rights Offering [Member] | Series C Convertible Preferred Stock [Member]                    
Class Of Stock [Line Items]                    
Number of shares callable by warrants (in shares)   20,000                
2018 Rights Offering [Member] | Series C Convertible Preferred Stock [Member] | Outstanding Warrants [Member]                    
Class Of Stock [Line Items]                    
Warrant exercise price (in dollars per share)   $ 1,000                
2018 Rights Offering [Member] | Common Stock [Member]                    
Class Of Stock [Line Items]                    
Number of shares callable by warrants (in shares)     1              
2018 Rights Offering [Member] | Common Stock [Member] | Outstanding Warrants [Member]                    
Class Of Stock [Line Items]                    
Number of shares callable by warrants (in shares)     50              
Series T Warrants [Member] | 2018 Rights Offering [Member] | Outstanding Warrants [Member]                    
Class Of Stock [Line Items]                    
Class of warrant outstanding       3,787,350       3,787,350    
Number of warrants exercised               75,747    
Series U Warrants [Member] | Outstanding Warrants [Member]                    
Class Of Stock [Line Items]                    
Number of shares callable by warrants (in shares)       3,447,500       3,447,500    
Class of warrant outstanding       3,045,000       3,045,000    
Number of warrants exercised               3,045,000