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Fair Value Measurement (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets: |  |
Marketable securities | $ 82,664 | $ 61,868
Foreign exchange contracts |  | 6
Government bonds |  |
Assets: |  |
Marketable securities | 495 | 497
Certificates of deposits |  |
Assets: |  |
Marketable securities | 747 |
Corporate bonds |  |
Assets: |  |
Marketable securities | 81,422 | 61,371
Level II |  |
Assets: |  |
Foreign exchange contracts |  | 6
Level II | Government bonds |  |
Assets: |  |
Marketable securities | 495 | 497
Level II | Certificates of deposits |  |
Assets: |  |
Marketable securities | 747 |
Level II | Corporate bonds |  |
Assets: |  |
Marketable securities | $ 81,422 | $ 61,371

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