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Basis of Presentation and Summary of Significant Accounting Policies - Financial Instruments (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 16, 2021
Dec. 31, 2021
Jun. 30, 2021
Jan. 31, 2020
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Class of Stock [Line Items]              
Amount paid for clearing fees     $ 19        
Warrants issued (in shares)         229,414 310,860  
Proceeds from the exercise of warrants         $ 0    
December 2021 Private Placement              
Class of Stock [Line Items]              
Sale of common stock (in shares)   1,193,185          
Sale of common stock (USD per share)   $ 3.52         $ 3.52
Securities called by warrants (in shares)         1,278,413    
Exercise price of common stock (USD per share)         $ 3.52    
Amount paid for placement agent commissions   $ 360          
Amount paid related to expenses for registered direct offering and concurrent private placement   42          
Amount paid for clearing fees   97          
Offering costs paid on the issuance of common stock and warrants   499          
Proceeds from sale of common stock and warrants   $ 4,000          
Estimated proceeds from issuance of warrants         $ 4,500    
December 2021 Private Placement | Pre-Funded Warrants              
Class of Stock [Line Items]              
Securities called by warrants (in shares)   85,228         85,228
Exercise price of common stock (USD per share)   $ 0.0001         $ 0.0001
Warrants issued (in shares) 85,228            
December 2021 Private Placement | Warrants              
Class of Stock [Line Items]              
Securities called by warrants (in shares)   1,278,413         1,278,413
Exercise price of common stock (USD per share)   $ 3.52         $ 3.52
Investor Warrants              
Class of Stock [Line Items]              
Sale of common stock (in shares)     990,100        
Sale of common stock (USD per share)     $ 5.05        
Exercise price of common stock (USD per share)       $ 3.37      
Amount paid for placement agent commissions     $ 400        
Amount paid related to expenses for registered direct offering and concurrent private placement     51        
Offering costs paid on the issuance of common stock and warrants             $ 470
Proceeds from sale of common stock and warrants     $ 4,500        
Warrants issued (in shares)         187,734 269,180  
January 2020 Equity Offering              
Class of Stock [Line Items]              
Exercise price of common stock (USD per share)         $ 3.67 $ 3.59  
Amount paid for placement agent commissions       $ 193      
Amount paid related to expenses for registered direct offering and concurrent private placement       50      
Amount paid for clearing fees       231      
Offering costs paid on the issuance of common stock and warrants             $ 510
Proceeds from sale of common stock and warrants       $ 2,300      
Warrants issued (in shares)         229,414 310,860  
Estimated proceeds from issuance of warrants         $ 800    
Proceeds from the exercise of warrants           $ 527  
Warrants exercised (in shares)         0 (156,446)  
January 2020 Institutional Investor              
Class of Stock [Line Items]              
Sale of common stock (in shares)       688,360      
Sale of common stock (USD per share)       $ 3.3700      
Securities called by warrants (in shares)       688,360      
Purchase price (USD per share)       $ 0.625      
January 2020 Equity Offering, Private Placement              
Class of Stock [Line Items]              
Securities called by warrants (in shares)       48,185      
Exercise price of common stock (USD per share)       $ 4.9940      
Warrants issued (in shares)         41,680 41,680