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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 6 Months Ended 12 Months Ended
Dec. 16, 2021
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Jan. 31, 2020
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Class of Stock [Line Items]                    
Amount paid for clearing fees       $ 18            
Offering costs paid on the issuance of common stock and warrants           $ 334 $ 469 $ 334 $ 469  
Warrants issued (in shares)               229,414 310,860  
Proceeds from the exercise of warrants           $ 0 $ 0 $ 0 $ 527  
June 2022 Private Placement                    
Class of Stock [Line Items]                    
Sale of common stock (in shares)   1,313,462                
Sale of common stock (USD per share)   $ 1.30       $ 1.30   $ 1.30    
Securities called by warrants (in shares)   4,071,158       4,071,158   4,071,158    
Exercise price of common stock (USD per share)   $ 0.86       $ 0.86   $ 0.86    
Amount paid for placement agent commissions   $ 252                
Amount paid related to expenses for registered direct offering and concurrent private placement   35                
Amount paid for clearing fees   47                
Offering costs paid on the issuance of common stock and warrants   334                
Proceeds from sale of common stock and warrants   $ 3,200                
Estimated proceeds from issuance of warrants           $ 3,500        
June 2022 Private Placement | Pre-Funded Warrants                    
Class of Stock [Line Items]                    
Securities called by warrants (in shares)   1,378,848       1,378,848   1,378,848    
Exercise price of common stock (USD per share)   $ 0.0001       $ 0.0001   $ 0.0001    
June 2022 Private Placement | Warrants                    
Class of Stock [Line Items]                    
Securities called by warrants (in shares)   2,692,310       2,692,310   2,692,310    
Exercise price of common stock (USD per share)   $ 1.30       $ 1.30   $ 1.30    
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       1,278,413   1,278,413    
Exercise price of common stock (USD per share)   $ 3.52       $ 3.52   $ 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     $ 5.05   $ 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                   $ 469
Proceeds from sale of common stock and warrants       $ 4,500            
Warrants issued (in shares)           187,734 269,180      
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      
January 2020 Equity Offering                    
Class of Stock [Line Items]                    
Exercise price of common stock (USD per share)   $ 3.67   $ 3.59   $ 3.67 $ 3.59 $ 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          
Estimated proceeds from issuance of warrants               $ 800    
Warrants issued (in shares)           229,414 310,860      
Warrants exercised (in shares)               0 (156,446)