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FAIR VALUE MEASUREMENTS - Change in Investment in Privately Held Companies (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Balance as of end of period | $ 6,338
Privately Held Investment |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Beginning balance | 4,871
New investments | 1,490
Sales of investments | (1,424)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Currency Translation Adjustment | (73)
Fair value adjustment | $ 1,474

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