Leases - Narrative (Details) $ in Thousands	Dec. 31, 2019 USD ($) ft²	Oct. 31, 2019 USD ($) ft²
Lessee, Lease, Description [Line Items]
Expected minimum payments over sublease term	$ 18,174
Weighted average remaining lease term	5 years 10 months 24 days
Weighted average discount rate	12.30%
Brisbane, California Office Space
Lessee, Lease, Description [Line Items]
Area leased (in sq ft) | ft²	40,232
Extension term	7 years
Letters of credit	$ 500	$ 200
Reduced letter of credit if conditions met	$ 200
Area leased (in sq ft) | ft²		20,116
Expected minimum payments over sublease term		$ 3,700