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Summary of Significant Accounting Policies - Narrative (Details) £ in Thousands, $ in Thousands, € in Millions	3 Months Ended
	Mar. 31, 2023 USD ($) region	Mar. 31, 2023 EUR (€) region	Mar. 31, 2023 GBP (£) region	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	Jan. 01, 2021 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of geographic regions | region	2	2	2
Expected dividend yield (in percent)	0.00%	0.00%	0.00%	0.00%
Operating lease right-of-use assets	$ 1,593				$ 2,006
Operating lease liabilities - current	1,112				$ 1,510
Foreign exchange gains	$ 2,685			$ 1,333
Maximum qualifying research and development expenditures with connected parties (in percent)	15.00%	15.00%	15.00%
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)	33.30%	33.30%	33.30%
Total aid claimable (in euros) | €		€ 7.5
Cap on payable claims (in GBP) | £			£ 20
United Kingdom Research and Development Tax Credit Regime
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash rebate percent (in percent)	21.70%	21.70%	21.70%
Annual offset amount (in euros) | £			£ 5,000
Percentage of taxable profits (in percent)	50.00%	50.00%	50.00%

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