Annual report pursuant to Section 13 and 15(d)

Property and Equipment - Narrative (Details)

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Property and Equipment - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
renewal_option
contract
Dec. 31, 2020
USD ($)
Property, Plant and Equipment [Line Items]    
Depreciation expense $ 0.1 $ 0.1
Number of operating leases | contract 2  
Remaining lease term 6 years 6 months  
Discount rate 9.20%  
Building | MARYLAND    
Property, Plant and Equipment [Line Items]    
Annual base rent $ 0.2  
Annual rent increase (as a percent) 2.50%  
Rent abatement period 12 months  
Lease term 10 years  
Number of renewal options | renewal_option 2  
Lease renewal term 5 years  
Building | PENNSYLVANIA    
Property, Plant and Equipment [Line Items]    
Annual base rent $ 0.3  
Annual rent increase (as a percent) 2.40%  
Rent abatement period 3 months  
Lease term 5 years 3 months  
Annual base rent $ 0.2  
Operating Lease, Expense $ 0.1