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Stockholders' Equity - Series D Convertible Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended
Jun. 15, 2020
May 08, 2020
Jun. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Class of Stock [Line Items]          
Number of shares called by warrants (in shares) 2,213,115        
Months until exercisable 6 months 6 months      
Exercise price of warrants (in dollars per share) $ 3.05     $ 0.01  
Conversion of stock, shares issued (in shares)     1,546,700    
Service receivable       $ 139 $ 2,171
Deemed dividend recognized on beneficial conversion features of convertible preferred stock $ 2,700        
Series D Convertible Preferred Stock          
Class of Stock [Line Items]          
Shares converted (in shares)     154,670    
Service receivable   $ 2,300      
Deemed dividend recognized on beneficial conversion features of convertible preferred stock   600      
Private Placement          
Class of Stock [Line Items]          
Amount financed under agreement   $ 2,300      
Number of shares called by warrants (in shares)   859,813      
Exercise price of warrants (in dollars per share)   $ 1.50      
Private Placement | Common Stock          
Class of Stock [Line Items]          
Stock issued (in shares)   602,833      
Private Placement | Series D Convertible Preferred Stock          
Class of Stock [Line Items]          
Stock issued (in shares)   154,670