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Stockholders' Equity - June 2020 Equity Offering (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jan. 31, 2020
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [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  
January 2020 Institutional Investor              
Share-based Compensation Arrangement by Share-based Payment Award [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          
Investor Warrants              
Share-based Compensation Arrangement by Share-based Payment Award [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 Equity Offering              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Exercise price of common stock (USD per share) $ 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          
Warrants issued (in shares)     229,414 310,860      
Estimated proceeds from issuance of warrants         $ 800    
Issuance of common stock upon the exercise of warrants (in shares)         0 156,446  
January 2020 Equity Offering, Private Placement              
Share-based Compensation Arrangement by Share-based Payment Award [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