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Leases - Narrative (Details)
$ in Thousands
 1 Months Ended 9 Months Ended
May 31, 2017
Sep. 27, 2019
USD ($)
ft²
renewal_option
Aug. 30, 2019
ft²
Apr. 30, 2019
USD ($)
ft²
Jan. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]          
Tenant improvement allowance   $ 1,742      
Cash paid for amounts included in the measurement of lease liabilities   $ 2,100      
Weighted average operating discount rate used to determine the operating lease liability   4.20%      
Weighted average remaining lease term for operating lease   8 years 3 months 18 days      
Alameda, California          
Lessee, Lease, Description [Line Items]          
Area of lease property (in square feet) | ft²   169,606      
Tenant improvement reimbursements         $ 8,200
Number of options to extend the Lease | renewal_option   2      
Option to terminate lease (after period) 8 years        
Lease option to extend period   5 years      
Operating lease, expansion (in square feet) | ft²     59,335 37,544  
Operating lease, surrendered (in square feet) | ft²       2,703  
Tenant improvement allowance       $ 1,700