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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Available-for-Sale Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Available-for-Sale Securities |  |
Amortized Cost | $ 204,808 | $ 306,706
Gross Unrealized Gains | 0 | 35
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 204,808 | 306,741
Credit loss | 0 |
U.S. government securities |  |
Available-for-Sale Securities |  |
Amortized Cost |  | 53,799
Gross Unrealized Gains |  | 35
Gross Unrealized Losses |  | 0
Estimated Fair Value |  | 53,834
U.S. commercial paper |  |
Available-for-Sale Securities |  |
Amortized Cost |  | 18,915
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Estimated Fair Value |  | 18,915
Money market funds |  |
Available-for-Sale Securities |  |
Amortized Cost | 204,808 | 233,992
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 204,808 | $ 233,992

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