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Stockholders' Equity - Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Class of Stock [Line Items]              
Warrant exercise price (in dollars per share)       $ 2.25   $ 2.25  
Warrant liability $ 3       $ 3   $ 7
Change in fair value of warrants $ (2)     $ 81 $ (4) $ (2,342)  
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) 3,272,500 1,907,000 2,534,879        
Warrants expected term 5 years       5 years    
Outstanding Warrants [Member]              
Class of Stock [Line Items]              
Warrant liability       $ 4,500   $ 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   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