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Stockholders' Equity - Warrants (Details) - USD ($)
 3 Months Ended
Jul. 25, 2018
Jul. 17, 2018
Mar. 31, 2020
Mar. 31, 2019
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  
Warrants expected term     5 years  
Representative Warrants [Member]        
Class Of Stock [Line Items]        
Number of shares callable by warrants (in shares)     75,000  
Warrant exercise price (in dollars per share)     $ 6.25  
Common Stock [Member]        
Class Of Stock [Line Items]        
Common stock issued (in shares)       139,855,000
Warrants expected term     5 years  
Series C Convertible Preferred Stock [Member]        
Class Of Stock [Line Items]        
Conversion Price Per Share $ 7.50      
Preferred stock conversion price reduced (in dollars per share) $ 3.2132      
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  
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    
Warrant exercise price (in dollars per share)   $ 1,000    
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    
Series T Warrants [Member] | 2018 Rights Offering [Member] | Outstanding Warrants [Member]        
Class Of Stock [Line Items]        
Class of warrant outstanding     3,788,400  
Number of warrants exercised     75,768  
Series U Warrants [Member] | Outstanding Warrants [Member]        
Class Of Stock [Line Items]        
Class of warrant outstanding     3,525,000  
Number of warrants exercised     3,525,000