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Fair Value Measurements (Details) - Recurring - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Assets    
Total assets $ 0 $ 102,000
Certificates of deposit    
Assets    
Restricted cash   102,000
Level 1    
Assets    
Total assets   0
Level 1 | Certificates of deposit    
Assets    
Restricted cash   0
Level 2    
Assets    
Total assets   102,000
Level 2 | Certificates of deposit    
Assets    
Restricted cash   102,000
Level 3    
Assets    
Total assets   0
Level 3 | Certificates of deposit    
Assets    
Restricted cash   $ 0