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INCOME TAXES (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax [Line Items] |  |  |
Final toll tax expense, Tax Cuts and Jobs Act of 2017 |  | $ 4,500,000 |
Tax benefit, re-measurement of net deferred tax liabilities, Tax Cuts and Jobs Act of 2017 |  |  | $ 43,400,000
Effective tax rate | 16.50% | (5.90%) | (468.70%)
Effective income tax rate reconciliation, nondeductible in-process research and development, amount | $ 64,900,000 |  |
Effective income tax rate reconciliation, tax effect on U.S. federal rate, from Rebound acquisition | 13,600,000 |  |
Effective income tax reconciliation, tax benefit, excess stock-based compensation deductions |  | $ 1,100,000 |
Tax benefit, net operating loss carryback, Tax Cuts and Jobs Act of 2017 |  | 2,100,000 |
Effective income tax rate reconciliation, foreign income tax rate differential, increase (decrease), amount | $ (5,700,000) | $ 3,100,000 |
Effective foreign income tax rate | 3.50% | 11.60% |
Increase (decrease) in effective foreign income tax rate during period | (11.60%) | (2.00%) |
Deferred tax assets, valuation allowance | $ 9,865,000 | $ 6,973,000 | $ 8,000,000.0
Deferred tax assets, gross | 141,922,000 | 104,950,000 | 96,500,000
Valuation allowance, period increase (decrease) | 2,900,000 | (1,000,000.0) | 4,400,000
Tax impact of repatriating foreign earnings | 0 |  |
Unrecognized tax benefits that would impact effective tax rate | 700,000 |  |
Amount of unrecorded benefit reasonably possible to be recognized (less than) | 0 |  |
Penalties and interest expense | 0 | 0 | 0
Penalties and interest accrued | 0 | $ 0 | $ 0
Federal |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | 130,100,000 |  |
Operating loss carryforwards, not subject to expiration | 18,900,000 |  |
Foreign Tax Authority |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | 37,500,000 |  |
Operating loss carryforwards, not subject to expiration | 35,300,000 |  |
Foreign Tax Authority | Expire Through 2024 |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards, subject to expiration | 1,300,000 |  |
Foreign Tax Authority | Expire Through 2025 |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards, subject to expiration | 900,000 |  |
Foreign Tax Authority | Switzerland |  |  |
Income Tax [Line Items] |  |  |
Effective income tax rate reconciliation, tax benefit, federal tax holiday | $ 9,400,000 |  |
Effective income tax rate reconciliation, tax benefit, federal tax holiday (in dollars per share) | $ 0.11 |  |
Federal tax credit | $ 12,100,000 |  |
Federal tax credit (in dollars per share) | $ 0.14 |  |
State and Local Jurisdiction |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | $ 42,800,000 |  |

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