Summary of Significant Accounting Policies - Schedule of Impact of Adoption on Consolidated Statement of Balance Sheet (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Liabilities:
Deferred revenue	$ 68,997	$ 22,962
Noncurrent deferred revenue	74,554	72,197
Stockholders' equity:
Accumulated deficit	(345,948)	$ (289,200)
Scenario, Previously Reported [Member]
Liabilities:
Deferred revenue	15,023
Noncurrent deferred revenue	86,379
Stockholders' equity:
Accumulated deficit	(303,799)
Accounting Standards Update 2014-09 [Member] \| Restatement Adjustment [Member]
Liabilities:
Deferred revenue	53,974
Noncurrent deferred revenue	(11,825)
Stockholders' equity:
Accumulated deficit	$ (42,149)

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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