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Summary of Significant Accounting Policies (Details) $ in Thousands		3 Months Ended		9 Months Ended
	Oct. 01, 2021	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)
Summary of Significant Accounting Policies
Allowance for doubtful accounts on grants receivable		$ 0		$ 0
Allowance for doubtful accounts on other receivables		0		0
Deferred offering costs incurred during the period		769	$ 0	3,210	$ 0
Grant income		3,037	3,192	$ 12,375	$ 8,146
Expected dividend yield				0.00%	0.00%
Other comprehensive (loss) gain related to foreign currency translation		$ (3)	$ 18	$ (9)	$ (40)
Number of operating segments \| segment				1
Subsequent Event
Summary of Significant Accounting Policies
Stock split ratio	0.3092
Minimum
Summary of Significant Accounting Policies
Useful life of property and equipment				5 years
Maximum
Summary of Significant Accounting Policies
Useful life of property and equipment				6 years