Leases - Lease liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	May 31, 2021	May 31, 2020
Lessee, Lease, Description [Line Items]
Operating lease costs	$ 93	$ 86
Variable lease costs	50	64
Total lease expense	$ 143	$ 150
Office Space
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Existence of Option to Extend [true false]	false