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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Total |  |
Fair value measurements |  |
Total assets measured at fair value | $ 71,468 |
Certificate of deposit | Total |  |
Fair value measurements |  |
Certificates of deposit | 363 |
Money market funds | Total |  |
Fair value measurements |  |
Money market funds | 71,105 |
Level 1 |  |
Fair value measurements |  |
Total assets measured at fair value | 71,105 |
Level 1 | Money market funds |  |
Fair value measurements |  |
Money market funds | 71,105 |
Level 2 |  |
Fair value measurements |  |
Total assets measured at fair value | 363 |
Level 2 | Certificate of deposit |  |
Fair value measurements |  |
Certificates of deposit | $ 363 |
Recurring basis | Total |  |
Fair value measurements |  |
Total assets measured at fair value |  | $ 1,856
Debt (Note 7) |  | 38,877
Total liabilities measured at fair value |  | 38,877
Recurring basis | Certificate of deposit | Total |  |
Fair value measurements |  |
Certificates of deposit |  | 363
Recurring basis | Money market funds | Total |  |
Fair value measurements |  |
Money market funds |  | 1,493
Recurring basis | Level 1 |  |
Fair value measurements |  |
Total assets measured at fair value |  | 1,493
Recurring basis | Level 1 | Money market funds |  |
Fair value measurements |  |
Money market funds |  | 1,493
Recurring basis | Level 2 |  |
Fair value measurements |  |
Total assets measured at fair value |  | 363
Debt (Note 7) |  | 38,877
Total liabilities measured at fair value |  | 38,877
Recurring basis | Level 2 | Certificate of deposit |  |
Fair value measurements |  |
Certificates of deposit |  | $ 363

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