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Summary of Impact of Adoption of ASC 606 to Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Contract assets | $ 3,750 |
Current liabilities: |  |
Deferred revenue | 20,043 | $ 14,574
Income taxes payable | 1,168 |
Stockholders’ equity: |  |
Retained earnings | 262,840 | 238,953
Accounting Standards Update 2014-09 | Balances without adoption of ASC 606 |  |
Current liabilities: |  |
Deferred revenue | 20,000 |
Stockholders’ equity: |  |
Retained earnings | 259,551 | 241,167
Accounting Standards Update 2014-09 | Impact of Adoption of ASC 606 |  |
Assets: |  |
Contract assets | 3,750 |
Current liabilities: |  |
Deferred revenue | 43 |
Income taxes payable | 1,168 |
Stockholders’ equity: |  |
Retained earnings | $ 3,289 | $ 2,214

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