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Revenue Recognition - Summary of Impact of Adoption to Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Contract assets | $ 3,000 |
Current liabilities: |  |
Deferred revenue | 7,320 | $ 14,574
Stockholders' equity: |  |
Retained earnings | 250,068 | 238,953
Accounting Standards Update 2014-09 |  |
Assets: |  |
Contract assets | 3,000 |
Current liabilities: |  |
Deferred revenue | 7,320 |
Deferred income tax liabilities | 786 |
Stockholders' equity: |  |
Retained earnings | 250,068 |
Accounting Standards Update 2014-09 | Balances without adoption of Topic 606 |  |
Current liabilities: |  |
Deferred revenue | 7,263 |
Stockholders' equity: |  |
Retained earnings | 247,854 | 241,167
Accounting Standards Update 2014-09 | Adjustment Due to Adoption of Topic 606 |  |
Assets: |  |
Contract assets | 3,000 |
Current liabilities: |  |
Deferred revenue | 57 |
Deferred income tax liabilities | 786 |
Stockholders' equity: |  |
Retained earnings | $ 2,214 | $ 2,214

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