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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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- 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=65884222&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=66010992&loc=d3e26626-111562

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Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

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