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INCOME TAXES - Narrative (Details) $ / shares in Units, SFr in Millions, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) $ / shares | Dec. 31, 2019 CHF (SFr)
Income Tax Contingency [Line Items] |  |  |  |  |
Effective income tax rate | 122.40% | 18.30% | 32.70% | (2.10%) |
Valuation allowance, foreign deferred tax assets | $ 3.4 |  | $ 3.4 |  |
Foreign Tax Authority | Swiss Federal Tax Administration (FTA) |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Effective income tax rate reconciliation, tax benefit, federal tax holiday |  |  |  | $ 10.8 |
Effective income tax rate reconciliation, tax benefit, federal tax holiday (in dollars per share) | $ / shares |  |  |  | $ 0.13 |
Federal tax credit | SFr |  |  |  |  | SFr 12.0

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