Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Operating leases expense	$ 4,440	$ 4,193
Amortization of ROU assets	26	23
Interest on lease liabilities	5	6
Total finance lease expense	31	29
Variable lease costs	443	271
Short term lease expense	120	88
Sublease income	(129)
Total lease expense	$ 4,905	$ 4,581