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INCOME TAXES - Narrative (Details) $ / shares in Units, SFr in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) $ / shares | Sep. 30, 2018 | Sep. 30, 2019 CHF (SFr) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
Income Tax Contingency [Line Items] |  |  |  |  |  |
Effective income tax rate | (0.40%) |  | (20.60%) | (3.50%) | (3.50%) | (8.40%)
Tax expense, tax reform-related adjustments, due to clarification in IRS guidance | $ 1.6 |  |  |  | $ 1.6 |
Tax benefit from Switzerland tax holiday |  | $ 10.8 |  |  |  |
Tax benefit from Switzerland tax holiday (in dollars per share) | $ / shares |  | $ 0.13 |  |  |  |
Tax benefit, related to share-based compensation |  |  |  |  |  | $ 1.2
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 |
Rebound |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
In-process research and development (IPR&D) expense | $ 59.9 |  |  |  | $ 59.9 |

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- Definition 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 nondeductible research and development expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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