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Subsequent Events (Details)
$ in Thousands
 1 Months Ended 9 Months Ended
Oct. 25, 2019
USD ($)
ft²
renewal_option
May 31, 2017
Sep. 27, 2019
ft²
renewal_option
Aug. 30, 2019
ft²
Apr. 30, 2019
ft²
Alameda, California          
Subsequent Event [Line Items]          
Area of lease property (in square feet)     169,606    
Number of options to extend the Lease | renewal_option     2    
Lease option to extend period     5 years    
Option to terminate lease (after period)   8 years      
Operating lease, expansion (in square feet)       59,335 37,544
Subsequent Event | Built-To-Suit Lease          
Subsequent Event [Line Items]          
Option to terminate lease (after period) 180 months        
Subsequent Event | Built-To-Suit Lease | Alameda, California          
Subsequent Event [Line Items]          
Area of lease property (in square feet) 220,000        
Operating lease term 242 months        
Estimated monthly base rent under Build-to-Suite Leases | $ $ 726        
Monthly base rent, lease not yet commenced, annual percentage increase 3.00%        
Number of options to extend the Lease | renewal_option 2        
Lease option to extend period 5 years