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Balance Sheet Components (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2017
Jan. 31, 2017
Dec. 31, 2016
Jul. 23, 2015
Balance Sheet Components [Line Items]            
Receivable from Prior Landlord     $ 755,000   $ 5,000,000  
Other long-term assets     188,000   9,813,000  
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]            
Landlord periodic payment received   $ 2,628,000        
Increase in receivable from Existing Landlord       $ 5,000,000    
Increase in landlord payments       $ 65,000    
Peninsula Innovation Partners, LLC [Member] | Fourth Lease Amendment Agreement [Member]            
Balance Sheet Components [Line Items]            
Landlord periodic payment received $ 1,682,000          
Receivable from Prior Landlord     $ 755,000      
O’Brien Lease Agreement [Member]            
Balance Sheet Components [Line Items]            
Other long-term assets         $ 9,600,000  
Tenant improvements   $ 28,900,000