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Summary of Significant Accounting Policies - Significant Accounting Policies (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Mar. 05, 2020
Research and development incentive income and receivable      
Research and development expenses reimbursed (as a percent) 43.50% 43.50%  
Research and development incentive income and receivable      
Balance at the beginning of the period $ 73 $ 185  
Australian research and development incentive income, net 1,226 231  
Cash received for eligible expenses (111) (331)  
Foreign currency translation 1 (12)  
Balance at the end of the period 1,189 73  
Business Combination, Contingent Consideration, Asset, Current 1,189 73  
Income Taxes      
Uncertain tax positions 0 0  
Deferred Offering Costs      
Deferred costs 0 345  
Other Assets      
Deposits with service providers that are to be applied to future payments $ 293 980  
Dividend attributable to down round feature of warrants   303  
Incremental borrowing rate 8.00%    
License and Service [Member]      
Other Assets      
Deposits with service providers that are to be applied to future payments $ 293 $ 980  
January 2020 Private Placement      
Other Assets      
Exercise price of warrant $ 1.055 $ 1.75 $ 2.11
Dividend attributable to down round feature of warrants   $ 303  
Computer equipment      
Property and Equipment      
Useful life (in years) 3 years    
Lab equipment      
Property and Equipment      
Useful life (in years) 5 years    
Office Equipment      
Property and Equipment      
Useful life (in years) 5 years    
Furnitures and fixtures      
Property and Equipment      
Useful life (in years) 5 years