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Commitments And Contingencies (Narrative) (Details)
 1 Months Ended 3 Months Ended 4 Months Ended 12 Months Ended
Jul. 23, 2015
USD ($)
item
Jul. 22, 2015
USD ($)
Dec. 31, 2017
USD ($)
item
Sep. 30, 2017
item
Jun. 30, 2017
USD ($)
May 31, 2017
USD ($)
Aug. 31, 2016
USD ($)
Feb. 29, 2016
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2017
USD ($)
item
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jan. 31, 2017
USD ($)
Jun. 30, 2016
USD ($)
Oct. 31, 2015
USD ($)
Operating Leased Assets [Line Items]                                      
Future minimum rent payments     $ 74,790,000                   $ 74,790,000 $ 74,790,000          
Other liabilities, non-current                             $ 1,664,000        
Gain on lease amendments                               $ 23,043,000      
Receivable from Prior Landlord                             5,000,000        
Rent expense                           6,300,000 200,000 $ 1,100,000      
Prepaid expenses and other current assets     2,249,000                   2,249,000 2,249,000 9,978,000        
Other long-term assets     45,000                   45,000 45,000 9,813,000        
Long-term restricted cash     4,500,000                   4,500,000 4,500,000 4,500,000       $ 4,500,000
Deferred rent, non-current     14,453,000                   14,453,000 14,453,000 19,000        
Other commitments estimated amount     16,200,000                   16,200,000 16,200,000          
Additional liability associated with indemnification obligations     0                   0 0          
Property, plant and equipment     70,114,000                   70,114,000 70,114,000 51,589,000        
Peninsula Innovation Partners, LLC [Member]                                      
Operating Leased Assets [Line Items]                                      
Receivable from Prior Landlord                             5,000,000        
O’Brien Lease Agreement [Member]                                      
Operating Leased Assets [Line Items]                                      
Future minimum rent payments     0                   0 $ 0          
Lease term   132 months                       11 years          
Rent expense first twelve months   $ 540,000                                  
Rent expense last twelve months   711,000                                  
Expected prepaid rent   2,200,000                                  
Expected security deposit   4,500,000                                  
Prepaid expenses and other current assets     0                   0 $ 0 2,200,000        
Other long-term assets                             9,600,000        
Expected improvement allowance   $ 12,600,000                                  
Long-term restricted cash     4,500,000                   4,500,000 4,500,000 4,500,000        
Tenant improvements                     $ 28,800,000                
Tenant allowance paid by landlord                     12,600,000                
Deferred rent, non-current                     12,600,000                
Leasehold Improvements [Member]                                      
Operating Leased Assets [Line Items]                                      
Property, plant and equipment     29,728,000                   $ 29,728,000 29,728,000 8,138,000        
Lease Amendment Agreement [Member] | Peninsula Innovation Partners, LLC [Member]                                      
Operating Leased Assets [Line Items]                                      
Number of eligible payments from existing landlord | item 4                                    
Eligible payments from existing landlord $ 5,000,000                                    
Gain on lease amendments                       $ 23,000,000              
Aggregate Landlord payments receivable                 $ 20,000,000     $ 20,000,000              
Landlord payment received             $ 5,000,000 $ 5,000,000 $ 5,000,000                    
Second Lease Amendment Agreement [Member] | Peninsula Innovation Partners, LLC [Member]                                      
Operating Leased Assets [Line Items]                                      
Receivable from Prior Landlord                                   $ 5,000,000  
Prepaid expenses and other current assets                             $ 5,000,000        
Third Lease Amendment Agreement [Member] | Peninsula Innovation Partners, LLC [Member]                                      
Operating Leased Assets [Line Items]                                      
Landlord payment received                     $ 2,628,000                
Increase in receivable from Existing Landlord                                 $ 65,000    
Increase in landlord payments                                 $ 65,000    
Fourth Lease Amendment Agreement [Member] | Peninsula Innovation Partners, LLC [Member]                                      
Operating Leased Assets [Line Items]                                      
Landlord payment received         $ 1,682,000         $ 1,682,000                  
Gain (loss) on termination of lease           $ 0                          
Fifth Lease Amendment Agreement [Member] | Peninsula Innovation Partners, LLC [Member]                                      
Operating Leased Assets [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