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Income Tax (Tables)
12 Months Ended
Dec. 31, 2021
Income Tax Disclosure [Abstract]  
Components of loss before income taxes
The components of the Company's loss before income taxes are as follows:
Year Ended December 31, 2021Year Ended December 31, 2020
United Kingdom$(72,244)$(51,197)
United States(16,358)(1,713)
Loss before income taxes$(88,602)$(52,910)
Significant components of the provision for income taxes
Significant components of the provision for income taxes are as follows:
Year Ended December 31, 2021Year Ended December 31, 2020
Current income tax benefit:
Federal United States$— $(215)
State - United States— 
Non-United States— — 
Total— (213)
Federal - United States— — 
State - United States— — 
Non-United States— — 
Total deferred tax— — 
Total income tax benefit$— $(213)
Major components of deferred tax assets and liabilities
The major components of deferred tax assets and liabilities are as follows:
December 31, 2021December 31, 2020
Deferred tax assets:
Net operating loss carryforward$49,422 $29,831 
Research and development credit carryforward941 — 
Stock based compensation2,560 1,167
Other1,477 491
Total deferred tax assets54,400 31,489
Deferred tax liabilities:
Intangible asset(2,600)(2,189)
Other(54)(71)
Total deferred tax liabilities(2,654)(2,260)
Net deferred tax assets before valuation allowance 51,74629,229
Valuation allowance(51,746)(29,229)
Deferred tax, net$— $— 
Reconciliation of the effective income tax rate to the statutory rate
A reconciliation of the Company's effective tax rate to the U.S. federal statutory rate is as follows:

Year Ended December 31, 2021Year Ended December 31, 2020
U.S. federal income tax statutory rate21.0 %21.0 %
Change in valuation allowance(10.5)%(12.1)%
Non-deductible expenses(0.4)%(3.9)%
Refundable research and development tax credit(8.3)%(7.0)%
Effect of foreign operations taxed at various rates0.5 %0.9 %
Stock-based compensation(1.6)%— %
Other(0.7)%1.4 %
— %0.30 %