Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Aug. 31, 2020	Mar. 31, 2020	Apr. 01, 2019
Lessor, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 663		$ 663			$ 1,532
Lease liability	$ 89		$ 89
Incremental borrowing rate							12.90%
Aggregate weighted average remaining lease payment term	2 years 1 month 6 days		2 years 1 month 6 days
Aggregate weighted average discount rate	13.10%		13.10%
Undiscounted payments	$ 103		$ 103
Rent expense	$ 400	$ 500	900	$ 900
Operating lease payments			$ 900	$ 900
Office Lease Facility In New York, New York
Lessor, Lease, Description [Line Items]
Undiscounted payments					$ 1,500
Term of lease contract					5 years 6 months
Accounting Standards Update 2016-02
Lessor, Lease, Description [Line Items]
Operating lease right-of-use assets							$ 3,000
Lease liability							2,400
Costs previously classified within other non-current assets							$ 600