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Summary of Significant Accounting Policies - Narrative (Details)
$ in Thousands, € in Millions, £ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
region
Sep. 30, 2022
EUR (€)
region
Sep. 30, 2022
GBP (£)
region
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Jan. 01, 2021
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Number of geographic regions | region     2 2 2      
Operating lease right-of-use assets $ 2,338   $ 2,338       $ 3,696  
Operating lease liabilities - current 1,831   1,831       $ 2,235  
Foreign exchange gains $ 1,096 $ 3,364 $ 4,387     $ 2,171    
Accounting Standards Update 2016-02                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Operating lease right-of-use assets               $ 1,000
Operating lease liabilities - current               $ 1,000
United Kingdom Research and Development Tax Credit Regime, Small or Medium-Sized Enterprises (SME)                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Cash rebate percent (in percent)     33.35% 33.35% 33.35%      
Total aid claimable | €       € 7.5        
United Kingdom Research and Development Tax Credit Regime                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Cash rebate percent (in percent)     21.67% 21.67% 21.67%      
Annual offset amount | £         £ 5.0      
Percentage of taxable profits (in percent)     50.00% 50.00% 50.00%