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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Litigation settlement | $ 35,000,000.0 |  |
Interest income | 2,700,000 | $ 4,400,000 | $ 4,900,000
Loss on extinguishment of debt | 16,500,000 |  |
Fair value adjustment of equity instrument | 3,400,000 | 1,700,000 | 700,000
Other than temporary impairment charge | 0 | 4,000,000.0 | 2,100,000
Foreign currency exchange (losses) gains, net | $ 600,000 | $ (900,000) | $ 5,300,000

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