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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) |

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