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AVAILABLE-FOR-SALE SECURITIES AND FAIR VALUE MEASUREMENTS - Available-for-Sale Securities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Available-for-Sale Securities |  |
Amortized Cost | $ 122,727 | $ 148,812
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (18) | 0
Estimated Fair Value | $ 122,709 | 148,813
Maturity period for marketable securities |  |
Maximum contractual maturity period | 1 year |
Average maturity | 3 months |
U.S. government securities |  |
Available-for-Sale Securities |  |
Amortized Cost | $ 9,943 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (1) |
Estimated Fair Value | 9,942 |
U.S. government agencies |  |
Available-for-Sale Securities |  |
Amortized Cost | 9,987 | 12,428
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (2) | 0
Estimated Fair Value | 9,985 | 12,429
U.S. corporate notes |  |
Available-for-Sale Securities |  |
Amortized Cost | 10,881 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (15) |
Estimated Fair Value | 10,866 |
U.S. commercial papers |  |
Available-for-Sale Securities |  |
Amortized Cost | 29,945 | 72,065
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 29,945 | 72,065
Money market funds |  |
Available-for-Sale Securities |  |
Amortized Cost | 61,971 | 64,319
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 61,971 | $ 64,319

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