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Fair Value Measurement (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Marketable securities | $ 82,446 | $ 82,664
Liabilities: |  |
Foreign exchange contracts | 84 |
Government bonds |  |
Assets: |  |
Marketable securities | 489 | 495
Certificates of deposits |  |
Assets: |  |
Marketable securities | 747 | 747
Corporate bonds |  |
Assets: |  |
Marketable securities | 81,210 | 81,422
Level II |  |
Liabilities: |  |
Foreign exchange contracts | 84 |
Level II | Government bonds |  |
Assets: |  |
Marketable securities | 489 | 495
Level II | Certificates of deposits |  |
Assets: |  |
Marketable securities | 747 | 747
Level II | Corporate bonds |  |
Assets: |  |
Marketable securities | $ 81,210 | $ 81,422

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