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Fair Value Measurement (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Assets: |  |
Marketable securities | $ 61,868 | $ 48,266
Foreign exchange contracts | 6 | 9
Government bonds |  |
Assets: |  |
Marketable securities | 497 |
Corporate bonds |  |
Assets: |  |
Marketable securities | 61,371 | 48,265
Certificates of deposits |  |
Assets: |  |
Marketable securities |  | 1
Level II |  |
Assets: |  |
Foreign exchange contracts | 6 | 9
Level II | Government bonds |  |
Assets: |  |
Marketable securities | 497 |
Level II | Corporate bonds |  |
Assets: |  |
Marketable securities | $ 61,371 | 48,265
Level II | Certificates of deposits |  |
Assets: |  |
Marketable securities |  | $ 1

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