Intangible Asset - Additional Information (Detail) £ in Millions, $ in Millions |
9 Months Ended | ||
---|---|---|---|
Dec. 31, 2019
USD ($)
|
Dec. 31, 2019
GBP (£)
|
Sep. 30, 2020 |
|
Finite Lived Intangible Assets [Line Items] | |||
Intangible asset estimated weighted- average remaining useful life | 9 years 9 months 18 days | ||
Milestone payment achieved | £ | £ 5 | ||
Increase in intangible assets | $ | $ 8.5 |