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Organization, Basis of Presentation and Summary of Significant Accounting Policies - Impact of Adoption of ASC on Condensed Consolidated Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
ASSETS      
Property and equipment, net $ 21,019   $ 78,723
Operating lease right-of-use assets 79,435    
Liabilities:      
Operating lease liabilities - current 2,485    
Deferred rent     271
Operating lease liabilities - long-term 41,550   27,689
Accumulated deficit $ (634,233)   (562,696)
Build-to-Suit Lease      
Liabilities:      
Operating lease liabilities - long-term     $ 27,689
Topic 842      
ASSETS      
Property and equipment, net   $ 16,223  
Operating lease right-of-use assets   8,753  
Prepaid rent   36,025  
Liabilities:      
Operating lease liabilities - current   1,408  
Operating lease liabilities - long-term   7,933  
Accumulated deficit   (561,799)  
Topic 842 | Adjustments Due to the Adoption of ASC Topic 842      
ASSETS      
Property and equipment, net   (62,500)  
Operating lease right-of-use assets   8,753  
Prepaid rent   36,025  
Liabilities:      
Operating lease liabilities - current   1,408  
Deferred rent   (271)  
Operating lease liabilities - long-term   7,933  
Accumulated deficit   897  
Topic 842 | Build-to-Suit Lease | Adjustments Due to the Adoption of ASC Topic 842      
Liabilities:      
Operating lease liabilities - long-term   $ (27,689)