XML 51 R30.htm IDEA: XBRL DOCUMENT v3.21.1
Intangible Asset - Additional Information (Detail)
£ in Millions, $ in Millions
1 Months Ended 3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2021
GBP (£)
Mar. 31, 2021
Finite-Lived Intangible Assets [Line Items]      
Intangible asset estimated weighted- average remaining useful life     9 years 3 months 18 days
Intangible asset estimated weighted- average remaining useful life extended period     10 years
Food and Drug Administration      
Finite-Lived Intangible Assets [Line Items]      
Milestone payment achieved | £   £ 7.5  
Increase in intangible assets | $ $ 12.0