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FAIR VALUE MEASUREMENTS - Available-for-Sale Investments Included in Cash Equivalents (Details) - Cash and Cash Equivalents - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | $ 81,831 | $ 82,334
Gross Unrealized Losses | (106) | (19)
Fair Value | 81,725 | 82,315
Level 1 | Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 1,017 | 11,659
Gross Unrealized Losses | 0 | 0
Fair Value | 1,017 | 11,659
Level 2 | Time deposits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 14,860 | 13,544
Gross Unrealized Losses | 0 | 0
Fair Value | 14,860 | 13,544
Level 2 | Municipal debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 14,059 | 347
Gross Unrealized Losses | (7) | 0
Fair Value | 14,052 | 347
Level 2 | Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 51,895 | 56,784
Gross Unrealized Losses | (99) | (19)
Fair Value | $ 51,796 | $ 56,765

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