Leases (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2019 ft²
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Option to renew		true
Operating Lease Cost (Cost resulting from lease payments)		$ 1,490
Operating Lease - Operating Cash Flows (Fixed Payments)		1,519
Operating Lease - Liabilities	$ 13,032	$ 13,032
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Operating Lease - Liabilities	Operating Lease - Liabilities
Weighted Average Lease Term - Operating Leases	4 years 9 months 15 days	4 years 9 months 15 days
Weighted Average Discount Rate - Operating Leases	3.86%	3.86%
Area of office space | ft²			54,910
Wallnut creek
Lessee, Lease, Description [Line Items]
Lease impairment and write-off of fixed assets and tenant improvements	$ 434
San Mateo
Lessee, Lease, Description [Line Items]
Lease impairment and write-off of fixed assets and tenant improvements	625
ASU 2018-11
Lessee, Lease, Description [Line Items]
Operating Lease - ROU assets	$ 12,173	$ 12,173