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FAIR VALUE MEASUREMENTS - RECURRING BASIS (Details) - Recurring basis - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets
Total	$ 127,182	$ 144,361
Money market funds
Assets
Total	11,193	4,577
Government-sponsored enterprise securities
Assets
Total	17,455	11,949
Commercial paper
Assets
Total	31,069	35,307
Corporate notes
Assets
Total	67,465	92,528
Level 1
Assets
Total	11,193	4,577
Level 1 | Money market funds
Assets
Total	11,193	4,577
Level 2
Assets
Total	115,989	139,784
Level 2 | Government-sponsored enterprise securities
Assets
Total	17,455	11,949
Level 2 | Commercial paper
Assets
Total	31,069	35,307
Level 2 | Corporate notes
Assets
Total	$ 67,465	$ 92,528

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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