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Stockholders' Equity - Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Dec. 31, 2020
Class of Stock [Line Items]              
Warrant exercise price (in dollars per share)           $ 2.25  
Warrant liability $ 5     $ 5     $ 7
Change in fair value of warrants     $ (756) $ (2) $ (2,423)    
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 securities called by warrant or right 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) 1,907,000,000 2,534,879,000          
Warrants expected term 5 years     5 years      
Outstanding Warrants [Member]              
Class of Stock [Line Items]              
Warrant liability           $ 4,500  
Change in fair value of warrants           $ 700  
Outstanding Warrants [Member] | Series U Warrants [Member]              
Class of Stock [Line Items]              
Number of securities called by warrant or right           3,447,500  
Class of warrant outstanding 2,141,000     2,141,000      
Number of warrants exercised       2,141,000      
Common Class A [Member]              
Class of Stock [Line Items]              
Common stock issued (in shares)       289,000      
Common Class B [Member]              
Class of Stock [Line Items]              
Number of securities called by warrant or right 2,711,000     2,711,000