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Summary of Significant Accounting Policies - Schedule of Impacts to Consolidated Balance Sheet Upon Adoption of 842 Guidance (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Assets      
Property and equipment, net $ 42,743 $ 127,198  
Finance lease right-of-use assets 39,602 0  
Liabilities, stockholders’ equity and non-controlling interests      
Finance lease liabilities, current 12,351 0  
Deferred rent   3,038  
Finance lease liabilities, non-current 37,610 0  
Accumulated deficit (784,720) $ (715,827) $ (630,657)
Derecognition Build to Suit Lease Assets [Member] | Building Shell [Member]      
Assets      
Property and equipment, net (53,880)    
Derecognition Build to Suit Lease Assets Accumulated Depreciation [Member] | Building Shell [Member]      
Assets      
Property and equipment, net 13,476    
Leasehold Improvements Accumulated Depreciation [Member]      
Assets      
Property and equipment, net (38,877)    
Recognition Finance Lease Assets [Member]      
Assets      
Finance lease right-of-use assets 49,597    
Recognition Operating Lease Assets [Member]      
Assets      
Other assets 730    
Derecognition Deferred Rent Current [Member]      
Liabilities, stockholders’ equity and non-controlling interests      
Accrued and other current liabilities (619)    
Derecognition Build to Suit Lease Liabilities Current [Member]      
Liabilities, stockholders’ equity and non-controlling interests      
Accrued and other current liabilities (545)    
Recognition Operating Lease Liabilities Current [Member]      
Liabilities, stockholders’ equity and non-controlling interests      
Accrued and other current liabilities 404    
Recognition Finance Lease Liabilities Current [Member]      
Liabilities, stockholders’ equity and non-controlling interests      
Finance lease liabilities, current 11,499    
Derecognition Build to Suit Lease Liabilities Non Current [Member]      
Liabilities, stockholders’ equity and non-controlling interests      
Long-term portion of lease obligations (95,613)    
Derecognition Deferred Rent Non Current [Member]      
Liabilities, stockholders’ equity and non-controlling interests      
Deferred rent (3,038)    
Recognition Finance Lease Liabilities Non Current [Member]      
Liabilities, stockholders’ equity and non-controlling interests      
Finance lease liabilities, non-current 49,884    
Recognition Operating Lease Liabilities Non Current [Member]      
Liabilities, stockholders’ equity and non-controlling interests      
Other long-term liabilities 250    
Cumulative Decrease to Accumulated Deficit [Member]      
Liabilities, stockholders’ equity and non-controlling interests      
Accumulated deficit $ 8,688