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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

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