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FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Included in cash and cash equivalents |  |
Amortized Cost | $ 7,307 | $ 10,285
Estimated Fair Value | 7,307 | 10,285
Restricted cash |  |
Amortized Cost | 795 | 795
Estimated Fair Value | 795 | 795
Marketable securities |  |
Amortized Cost | 137,332 | 52,248
Gross Unrealized Gains | 17 | 5
Gross Unrealized Losses | (37) | (19)
Estimated Fair Value | 137,312 | 52,234
Money market funds |  |
Included in cash and cash equivalents |  |
Amortized Cost | 5,807 | 8,079
Estimated Fair Value | 5,807 | 8,079
Commercial paper |  |
Included in cash and cash equivalents |  |
Amortized Cost | 1,500 |
Estimated Fair Value | 1,500 |
Corporate notes |  |
Included in cash and cash equivalents |  |
Amortized Cost |  | 2,206
Estimated Fair Value |  | 2,206
Certificates of deposit |  |
Restricted cash |  |
Amortized Cost | 795 | 795
Estimated Fair Value | 795 | 795
Government-sponsored enterprise securities (due in less than 1 year) |  |
Marketable securities |  |
Amortized Cost | 4,192 | 7,369
Gross Unrealized Gains |  | 1
Gross Unrealized Losses |  | (1)
Estimated Fair Value | 4,192 | 7,369
Government-sponsored enterprise securities (due in 1 to 2 years) |  |
Marketable securities |  |
Amortized Cost | 401 |
Estimated Fair Value | 401 |
Commercial paper (due in less than 1 year) |  |
Marketable securities |  |
Amortized Cost | 12,486 | 5,496
Gross Unrealized Gains | 12 | 3
Estimated Fair Value | 12,498 | 5,499
Corporate notes (due in less than 1 year) |  |
Marketable securities |  |
Amortized Cost | 114,157 | 39,383
Gross Unrealized Gains | 5 | 1
Gross Unrealized Losses | (36) | (18)
Estimated Fair Value | 114,126 | 39,366
Corporate notes (due in 1 to 2 years) |  |
Marketable securities |  |
Amortized Cost | 6,096 |
Gross Unrealized Losses | (1) |
Estimated Fair Value | $ 6,095 |

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