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Summary of Impact of Adoption of ASC 606 to Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets:
Contract assets	$ 3,000
Current liabilities:
Deferred revenue	609	$ 14,574
Deferred income tax liabilities	786
Stockholders' equity:
Retained earnings	256,005	238,953
Accounting Standards Update 2014-09 | Balances without adoption of ASC 606
Current liabilities:
Deferred revenue	550
Stockholders' equity:
Retained earnings	253,791	241,167
Accounting Standards Update 2014-09 | Impact of Adoption of ASC 606
Assets:
Contract assets	3,000
Current liabilities:
Deferred revenue	59
Deferred income tax liabilities	786
Stockholders' equity:
Retained earnings	$ 2,214	$ 2,214

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