Leases - Operating Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 729	$ 519	$ 1,458	$ 1,038
Variable lease cost	100	46	190	55
Total lease cost	$ 829	$ 565	$ 1,648	$ 1,093