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Balance Sheet Components (Narrative) (Details) - USD ($)
 1 Months Ended 12 Months Ended
Aug. 31, 2016
Feb. 29, 2016
Sep. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jan. 31, 2017
Jun. 30, 2016
Balance Sheet Components [Line Items]                
Receivable from existing landlord       $ 5,000,000 $ 10,000,000      
Lease incentive receivable, noncurrent         5,000,000      
Prepaid expenses and other current assets       9,978,000 12,071,000      
Other long-term assets       9,813,000 7,518,000      
Construction-in-progress       5,800,000        
Depreciation expense       3,875,000 3,677,000 $ 4,221,000    
Lease Amendment Agreement [Member]                
Balance Sheet Components [Line Items]                
Receivable from existing landlord         15,000,000      
Prepaid expenses and other current assets       5,000,000 10,000,000      
Other long-term assets         5,000,000     $ 5,000,000
Landlord periodic payment received $ 5,000,000 $ 5,000,000 $ 5,000,000          
O’Brien Lease Agreement [Member]                
Balance Sheet Components [Line Items]                
Other long-term assets       9,600,000 $ 2,200,000      
Construction-in-progress       $ 5,200,000        
Third Lease Amendment Agreement [Member]                
Balance Sheet Components [Line Items]                
Increase in receivable from Existing Landlord             $ 65,000