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Stockholders' Equity - December 2021 Private Placement (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Dec. 16, 2021
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2022
Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Amount paid for clearing fees     $ 19    
Warrants issued (in shares)       229,414 310,860
December 2021 Private Placement          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Sale of common stock (in shares)   1,193,185      
Sale of common stock (USD per share)   $ 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          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Securities called by warrants (in shares)   85,228      
Exercise price of common stock (USD per share)   $ 0.0001      
Warrants issued (in shares) 85,228        
December 2021 Private Placement | Warrants          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Securities called by warrants (in shares)   1,278,413      
Exercise price of common stock (USD per share)   $ 3.52