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Revenue Recognition - Summary of the Post Adoption Impact of ASC 606 - Balance Sheet (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Assets    
Prepaid expenses and other current assets $ 28,638 $ 20,310
Other non-currentassets 56,127 67,107
Liabilities    
Current deferred revenue 36,227 43,448
Other non-currentliabilities 87,546 134,655
Equity    
Accumulated deficit (1,092,623) $ (1,089,369)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]    
Assets    
Prepaid expenses and other current assets (458)  
Other non-currentassets 73,664  
Liabilities    
Current deferred revenue 20,086  
Other non-currentliabilities 85,252  
Equity    
Accumulated deficit (24,165)  
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | As Reported [Member]    
Assets    
Prepaid expenses and other current assets 28,180  
Other non-currentassets 129,791  
Liabilities    
Current deferred revenue 56,313  
Other non-currentliabilities 172,798  
Equity    
Accumulated deficit $ (1,116,788)