FAIR VALUE DISCLOSURES (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 6 Months Ended | 12 Months Ended |
May 31, 2018 | Apr. 30, 2018 | Dec. 31, 2017 | Feb. 28, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Payments to Acquire Intangible Assets | | | | | | $ 5,169 | $ 50,956 | | |
Long-term Debt, Total | | | | | | 132,100 | | | |
Finite-Lived Intangible Assets, Gross | $ 1,000 | | $ 284,716 | | | 288,215 | | $ 284,716 | |
Inventory, Finished Goods, Gross | | | 13,901 | [1] | | 10,280 | | 13,901 | [1] |
InventoryRawMaterials | | | 22,139 | | | 25,766 | | 22,139 | |
Derivative Asset, Notional Amount | | | | | | $ 74,100 | | | |
Measurement Input, Discount Rate [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Fair Value Input Discount Rate | | | | | | 15.00% | | | |
Inderal XL [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Finite-Lived Intangible Assets, Gross | | | | | $ 15,100 | | | | |
Finite-Lived Intangible Asset, Useful Life | | | | | 10 years | | | | |
Acquisition Costs Capitalized | | | | | $ 40 | | | | |
Inventory, Finished Goods, Gross | | | | | 5,000 | | | | |
Asset Acquisition Purchase Price | | | | | $ 20,200 | | | | |
Inderal XL [Member] | Measurement Input, Discount Rate [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Fair Value Input Discount Rate | | | | | 10.00% | | | | |
InnoPran XL [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Finite-Lived Intangible Assets, Gross | | | | | $ 19,000 | | | | |
Finite-Lived Intangible Asset, Useful Life | | | | | 10 years | | | | |
Acquisition Costs Capitalized | | | | | $ 100 | | | | |
Inventory, Finished Goods, Gross | | | | | 11,600 | | | | |
Asset Acquisition Purchase Price | | | | | $ 30,600 | | | | |
InnoPran XL [Member] | Measurement Input, Discount Rate [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Fair Value Input Discount Rate | | | | | 10.00% | | | | |
InnoPran XL [Member] | Cash [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Payments to Acquire Intangible Assets | | | | | $ 600 | | | | |
InnoPran XL [Member] | Line of Credit [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Payments to Acquire Intangible Assets | | | | | $ 30,000 | | | | |
Fair Value, Inputs, Level 1 [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Notes Payable, Fair Value Disclosure | | | | | | $ 161,000 | | | |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Interest Rate Derivative Assets, at Fair Value | | | | | | 300 | | | |
Equipment [Member] | Impax Laboratories, Inc. [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Finite-Lived Intangible Assets, Gross | $ 58 | | | | | | | | |
Finite-Lived Intangible Asset, Useful Life | 5 years | | | | | | | | |
Teva Pharmaceuticals [Member] | Milestone One [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Contingent Liability Not Recognized | $ 25,000 | | | | | | | | |
Teva Pharmaceuticals [Member] | Milestone Two [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Contingent Liability Not Recognized | 15,000 | | | | | | | | |
Abbreviated New Drug Applications [Member] | Impax Laboratories, Inc. [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Payments to Acquire Intangible Assets | 2,300 | | | | | | | | |
Finite-Lived Intangible Assets, Gross | $ 1,000 | | | | | | | | |
Finite-Lived Intangible Asset, Useful Life | 10 years | | | | | | | | |
Acquisition Costs Capitalized | $ 100 | | | | | | | | |
Contingent Consideration In An Asset Purchase | $ 10,000 | | | | | | | | |
Abbreviated New Drug Applications [Member] | Impax Laboratories, Inc. [Member] | Maximum [Member] | Measurement Input, Discount Rate [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Fair Value Input Discount Rate | 15.00% | | | | | | | | |
Abbreviated New Drug Applications [Member] | Impax Laboratories, Inc. [Member] | Minimum [Member] | Measurement Input, Discount Rate [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Fair Value Input Discount Rate | 10.00% | | | | | | | | |
Abbreviated New Drug Applications [Member] | IDT Australia, Limited [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Payments to Acquire Intangible Assets | | $ 2,700 | | | | | | | |
Finite-Lived Intangible Assets, Gross | | $ 2,500 | | | | | | | |
Finite-Lived Intangible Asset, Useful Life | | 10 years | | | | | | | |
Acquisition Costs Capitalized | | $ 18 | | | | | | | |
Abbreviated New Drug Applications [Member] | IDT Australia, Limited [Member] | Maximum [Member] | Measurement Input, Discount Rate [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Fair Value Input Discount Rate | | 15.00% | | | | | | | |
Abbreviated New Drug Applications [Member] | IDT Australia, Limited [Member] | Minimum [Member] | Measurement Input, Discount Rate [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Fair Value Input Discount Rate | | 10.00% | | | | | | | |
Acquired New Drug Applications [Member] | IDT Australia, Limited [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Payments to Acquire Intangible Assets | | $ 2,700 | | | | | | | |
Finite-Lived Intangible Assets, Gross | | $ 2,500 | | | | | | | |
Finite-Lived Intangible Asset, Useful Life | | 10 years | | | | | | | |
Acquisition Costs Capitalized | | $ 18 | | | | | | | |
InventoryRawMaterials | | | | | | $ 200 | | | |
In Process Research and Development [Member] | Impax Laboratories, Inc. [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Finite-Lived Intangible Assets, Gross | $ 1,300 | | | | | | | | |
In Process Research and Development [Member] | Impax Laboratories, Inc. [Member] | Measurement Input, Discount Rate [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Fair Value Input Discount Rate | 75.00% | | | | | | | | |
AstraZeneca AB and AstraZeneca UK Limited [Member] | New Drug Applications [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Payments to Acquire Intangible Assets | | | 46,500 | | | | | 46,500 | |
Finite-Lived Intangible Assets, Gross | | | $ 46,700 | | | | | $ 46,700 | |
Finite-Lived Intangible Asset, Useful Life | | | 10 years | | | | | 10 years | |
Acquisition Costs Capitalized | | | $ 200 | | | | | | |
Accumulated Capitalized Interest Costs | | | 200 | | | | | $ 200 | |
Contingent Consideration In An Asset Purchase | | | $ 3,000 | | | | | $ 3,000 | |
AstraZeneca AB and AstraZeneca UK Limited [Member] | New Drug Applications [Member] | Measurement Input, Discount Rate [Member] | | | | | | | | | |
Fair Value Inputs, Assets, Quantitative Information | | | | | | | | | |
Fair Value Input Discount Rate | | | | | | | | 10.00% | |
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[1] | Includes finished goods acquired in asset purchases (Note 12). |