INCOME TAXES - Narrative (Details) $ / shares in Units, SFr in Millions, $ in Millions	3 Months Ended
Mar. 31, 2019 CHF (SFr)	Mar. 31, 2019 USD ($) $ / shares	Mar. 31, 2018
Income Tax Contingency [Line Items]
Effective income tax rate	(32.00%)	(32.00%)	(20.40%)
Tax benefit from Switzerland tax holiday \| $		$ 10.8
Tax benefit from Switzerland tax holiday (in dollars per share) \| $ / shares		$ 0.13
Foreign Tax Authority \| Swiss Federal Tax Administration (FTA)
Income Tax Contingency [Line Items]
Federal tax credit \| SFr	SFr 12
Federal tax credit, term	7 years	7 years

Tax Credit, Term

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(2))
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-Topic 740
-SubTopic 10
-Section 50
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Per share amount effect of the income tax benefit resulting from the income tax holidays granted by taxing jurisdictions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Subparagraph (SAB Topic 11.C)
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income exempt from income tax because of a tax holiday.

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