Leases - Component of Lease Cost and Consolidated Balance Sheet Amounts (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Mar. 31, 2019
Leases [Abstract]
Operating lease cost	$ 569	$ 1,489
Short-term lease cost	63	318
Variable lease cost	97	304
Sublease income	0	0
Total lease cost	729	2,111
Operating leases
Operating lease right-of-use assets	8,458	8,458	$ 0
Operating lease liabilities	$ 8,913	$ 8,913
Weighted-average remaining lease term
Operating leases	14 years 3 months	14 years 3 months
Weighted-average discount rate
Operating leases	4.51%	4.51%