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FAIR VALUE MEASUREMENTS - Available-for-Sale Investments Included in Cash Equivalents (Details) - Cash and Cash Equivalents - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | $ 83,412 | $ 85,363
Gross Unrealized Losses | (10) | (33)
Fair Value | 83,402 | 85,330
Level 1 | Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 30,810 | 3,281
Gross Unrealized Losses | 0 | 0
Fair Value | 30,810 | 3,281
Level 2 | Time deposits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 14,904 | 18,071
Gross Unrealized Losses | 0 | 0
Fair Value | 14,904 | 18,071
Level 2 | Municipal debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 3,432 | 12,149
Gross Unrealized Losses | 1 | (7)
Fair Value | 3,433 | 12,142
Level 2 | Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 34,266 | 51,862
Gross Unrealized Losses | (11) | (26)
Fair Value | $ 34,255 | $ 51,836

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