Leases - Narrative (Details) $ in Millions	12 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2021 USD ($) ft²
Lessee, Lease, Description [Line Items]
Rent expense under ASC 840	$ 2.1
Vehicles
Lessee, Lease, Description [Line Items]
Letters of credit		$ 0.6
Brisbane, California Office Space | Office Space
Lessee, Lease, Description [Line Items]
Area leased (in sq ft) | ft²		40,232
Extension term		7 years
Letters of credit		$ 0.5
Reduced letter of credit if conditions met		$ 0.2
Weighted average remaining lease term		4 years 8 months 12 days
Weighted average discount rate		12.30%
Additional Brisbane, California Office Space | Office Space
Lessee, Lease, Description [Line Items]
Letters of credit		$ 0.2
Area subleased | ft²		20,116