Leases - Lease liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Aug. 31, 2021	Aug. 31, 2020
Lessee, Lease, Description [Line Items]
Operating lease costs	$ 140	$ 124
Variable lease costs	86	97
Total lease expense	$ 226	$ 221
Office Space
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Existence of Option to Extend [true false]	false