Cumulative Effect to Condensed Consolidated Balance Sheet for Adoption of New Revenue Standard (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Deferred revenue, current portion	$ 35,855	$ 7,242	$ 41,705
Deferred revenue, net of current portion	7,676	9,328	43,075
Accumulated deficit	(2,220,689)	(2,079,475)	$ (2,147,685)
ASU 2014-09 Revenue from Contracts with Customers \| Effect of Change Higher/(Lower)
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Deferred revenue, current portion	(17,005)	(34,463)
Deferred revenue, net of current portion	(17,993)	(33,747)
Accumulated deficit	$ (35,083)	$ 68,210

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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