Commitments and Contingencies (Details) $ in Thousands	Jun. 30, 2018 ft² claim	Jan. 16, 2018 USD ($) ft²
Loss Contingencies [Line Items]
Number of claims | claim	0
Emeryville, CA
Loss Contingencies [Line Items]
Lease agreement square footage (in sqft) | ft²	18,500
Lessee, operating lease, rentable square feet (in sqft) | ft²		37,626
Lessee, operating lease, tenet improvement allowance		$ 1,100
Lessee, operating lease, initial monthly lease payment		160
Lessee, operating lease, monthly lease payment, final year of agreement		$ 197