Leases (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 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)	$ 1,769
Operating Lease - Operating Cash Flows (Fixed Payments)	1,190
Operating Lease - ROU assets	38,098
Operating Lease - Liabilities	$ 38,098
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Operating Lease - Liabilities
Weighted Average Lease Term - Operating Leases	8 years 7 months 21 days
Weighted Average Discount Rate - Operating Leases	4.52%
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