Property and Equipment - Summary of Property and Equipment (Detail)
$ in Thousands
Dec. 31, 2021
USD ($)
Property, Plant and Equipment [Line Items]  
Cost $ 302
Accumulated Depreciation 287
Net Book Value 15
Computer equipment [Member]  
Property, Plant and Equipment [Line Items]  
Cost 141
Accumulated Depreciation 138
Net Book Value 3
Furniture and fixtures [Member]  
Property, Plant and Equipment [Line Items]  
Cost 42
Accumulated Depreciation 42
Leasehold improvements [Member]  
Property, Plant and Equipment [Line Items]  
Cost 26
Accumulated Depreciation 19
Net Book Value 7
Computer software [Member]  
Property, Plant and Equipment [Line Items]  
Cost 74
Accumulated Depreciation 74
Equipment under capital lease [Member]  
Property, Plant and Equipment [Line Items]  
Cost 19
Accumulated Depreciation 14
Net Book Value $ 5