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Fair Value Measurement (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets:
Marketable securities	$ 78,783	$ 82,664
Government bonds
Assets:
Marketable securities	490	495
Certificates of deposits
Assets:
Marketable securities	747	747
Corporate bonds
Assets:
Marketable securities	77,546	81,422
Level II | Government bonds
Assets:
Marketable securities	490	495
Level II | Certificates of deposits
Assets:
Marketable securities	747	747
Level II | Corporate bonds
Assets:
Marketable securities	$ 77,546	$ 81,422

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26626-111562

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