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Fair Value Measurement (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets:
Marketable securities	$ 85,212	$ 82,664
Liabilities:
Foreign exchange contracts	5
Government bonds
Assets:
Marketable securities	491	495
Certificates of deposits
Assets:
Marketable securities	747	747
Corporate bonds
Assets:
Marketable securities	83,974	81,422
Level II
Liabilities:
Foreign exchange contracts	5
Level II | Government bonds
Assets:
Marketable securities	491	495
Level II | Certificates of deposits
Assets:
Marketable securities	747	747
Level II | Corporate bonds
Assets:
Marketable securities	$ 83,974	$ 81,422

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- Definition

Amount of investments in debt securities classified as available-for-sale, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562

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Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

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