Commitments and Contingencies - Lease Cost (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 1,205	$ 2,410
Variable lease cost	140	274
Cash paid for amounts included in the measurement of operating lease liabilities	$ 1,293	$ 2,575
Weighted average remaining lease term (in years)	2 years 8 months 12 days	2 years 8 months 12 days
Weighted average discount rate	5.50%	5.50%
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term		1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term		6 years