License Agreements - Additional Information (Detail) £ in Millions, $ in Millions	Nov. 30, 2020	Apr. 15, 2019 GBP (£)	Apr. 15, 2019 USD ($)
Licenses Agreements [Line Items]
Accrued license fee		£ 0.6	$ 0.8
Minimum
Licenses Agreements [Line Items]
Royalty on every net sales	0.75%
Maximum
Licenses Agreements [Line Items]
Royalty on every net sales	2.00%