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Balance Sheet Components (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 22, 2015
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2017
Jan. 31, 2017
Dec. 31, 2016
Jul. 23, 2015
Balance Sheet Components [Line Items]              
Receivable from Prior Landlord   $ 755,000   $ 755,000   $ 5,000,000  
Prepaid expenses and other current assets   3,545,000   3,545,000   9,978,000  
Other long-term assets   184,000   184,000   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   755,000      
O’Brien Lease Agreement [Member]              
Balance Sheet Components [Line Items]              
Prepaid expenses and other current assets   $ 1,100,000 2,200,000 $ 1,100,000   2,200,000  
Other long-term assets           $ 9,600,000  
Lease term 132 months     11 years      
Expected improvement allowance $ 12,600,000            
Tenant improvements     $ 28,900,000