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FAIR VALUE MEASUREMENTS - RECURRING BASIS (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Assets |  |
Total | $ 144,361 | $ 167,919
Liabilities |  |
Derivatives |  | 16
Money market funds |  |
Assets |  |
Total | 4,577 | 40,342
Government-sponsored enterprise securities |  |
Assets |  |
Total | 11,949 | 6,949
Commercial paper |  |
Assets |  |
Total | 35,307 | 10,999
Corporate notes |  |
Assets |  |
Total | 92,528 | 109,629
Level 1 |  |
Assets |  |
Total | 4,577 | 40,342
Level 1 | Money market funds |  |
Assets |  |
Total | 4,577 | 40,342
Level 2 |  |
Assets |  |
Total | 139,784 | 127,577
Level 2 | Government-sponsored enterprise securities |  |
Assets |  |
Total | 11,949 | 6,949
Level 2 | Commercial paper |  |
Assets |  |
Total | 35,307 | 10,999
Level 2 | Corporate notes |  |
Assets |  |
Total | $ 92,528 | 109,629
Level 3 |  |
Liabilities |  |
Derivatives |  | $ 16

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