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Commitments And Contingencies (Narrative) (Details)
 1 Months Ended 3 Months Ended
Jul. 23, 2015
USD ($)
item
Jul. 22, 2015
USD ($)
Mar. 31, 2017
USD ($)
Feb. 28, 2017
USD ($)
Aug. 31, 2016
USD ($)
Feb. 29, 2016
USD ($)
Sep. 30, 2015
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Sep. 30, 2015
USD ($)
Jan. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Oct. 31, 2015
USD ($)
Dec. 31, 2009
USD ($)
Operating Leased Assets [Line Items]                            
Property, plant and equipment     $ 80,589,000         $ 80,589,000       $ 51,589,000    
Future minimum rent payments     79,041,000         79,041,000            
Other liabilities, non-current     1,741,000         1,741,000       1,664,000    
Rent expense               1,600,000 $ 53,000          
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    
Long-term restricted cash     4,500,000         4,500,000       4,500,000    
Deferred rent, non-current     14,148,000         $ 14,148,000       19,000    
O’Brien Lease Agreement [Member]                            
Operating Leased Assets [Line Items]                            
Tenant improvement allowance                           $ 1,800,000
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     2,200,000         $ 2,200,000       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    
Tenant improvements     28,900,000         28,900,000            
Tenant allowance paid by landlord               12,600,000            
Deferred rent, non-current     12,600,000         12,600,000            
Lease Amendment Agreement [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 periodic payment received         $ 5,000,000 $ 5,000,000 $ 5,000,000              
Second Lease Amendment Agreement [Member]                            
Operating Leased Assets [Line Items]                            
Prepaid expenses and other current assets                       5,000,000    
Third Lease Amendment Agreement [Member]                            
Operating Leased Assets [Line Items]                            
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      
Leasehold Improvements [Member]                            
Operating Leased Assets [Line Items]                            
Property, plant and equipment     $ 38,109,000         $ 38,109,000       $ 8,138,000    
Leasehold Improvements [Member] | O’Brien Lease Agreement [Member]                            
Operating Leased Assets [Line Items]                            
Property, plant and equipment                           3,000,000
Manufacturing Facility [Member] | O’Brien Lease Agreement [Member]                            
Operating Leased Assets [Line Items]                            
Property, plant and equipment                           1,200,000
Landlord Incentives [Member] | O’Brien Lease Agreement [Member]                            
Operating Leased Assets [Line Items]                            
Property, plant and equipment                           $ 1,800,000