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Balance Sheet Components (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended
Jul. 22, 2015
Mar. 31, 2017
Feb. 28, 2017
Mar. 31, 2017
Jan. 31, 2017
Dec. 31, 2016
Balance Sheet Components [Line Items]            
Receivable from existing landlord   $ 2,437,000   $ 2,437,000   $ 5,000,000
Prepaid expenses and other current assets   6,501,000   6,501,000   9,978,000
Other long-term assets   219,000   219,000   9,813,000
O’Brien Lease Agreement [Member]            
Balance Sheet Components [Line Items]            
Prepaid expenses and other current assets   2,200,000   $ 2,200,000   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   $ 28,900,000    
Third Lease Amendment Agreement [Member]            
Balance Sheet Components [Line Items]            
Lease incentive receivable, noncurrent         $ 65,000  
Landlord periodic payment received   1,583,000 $ 1,045,000      
Prepaid expenses and other current assets   $ 2,437,000   $ 2,437,000    
Increase in receivable from Existing Landlord         $ 65,000