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Balance Sheet Components (Narrative) (Details)
 1 Months Ended 3 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
item
Sep. 30, 2017
item
Jun. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
item
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jan. 31, 2017
USD ($)
Jul. 23, 2015
USD ($)
Balance Sheet Components [Line Items]                      
Prepaid expenses and other current assets $ 2,249,000         $ 2,249,000 $ 2,249,000 $ 9,978,000      
Receivable from Prior Landlord               5,000,000      
Other long-term assets 45,000         45,000 45,000 9,813,000      
Construction-in-progress               5,800,000      
Depreciation expense             8,442,000 3,875,000 $ 3,677,000    
O’Brien Lease Agreement [Member]                      
Balance Sheet Components [Line Items]                      
Prepaid expenses and other current assets 0         0 0 2,200,000      
Other long-term assets               9,600,000      
Leasehold improvements 9,600,000         $ 9,600,000 9,600,000        
Construction-in-progress               5,200,000      
Tenant improvements         $ 28,800,000            
Peninsula Innovation Partners, LLC [Member]                      
Balance Sheet Components [Line Items]                      
Lease incentive receivable, noncurrent                     $ 20,000,000
Receivable from Prior Landlord               $ 5,000,000      
Peninsula Innovation Partners, LLC [Member] | Third Lease Amendment Agreement [Member]                      
Balance Sheet Components [Line Items]                      
Increase in receivable from Existing Landlord                   $ 65,000  
Increase in landlord payments                   $ 65,000  
Landlord payment received         $ 2,628,000            
Peninsula Innovation Partners, LLC [Member] | Fourth Lease Amendment Agreement [Member]                      
Balance Sheet Components [Line Items]                      
Landlord payment received     $ 1,682,000 $ 1,682,000              
Peninsula Innovation Partners, LLC [Member] | Fifth Lease Amendment Agreement [Member]                      
Balance Sheet Components [Line Items]                      
Landlord payment received $ 755,000           $ 755,000        
Number of buildings in which the term and rent abatement period were extended | item   2                  
Number of buildings returned to Prior Landlord | item 2         2