GOODWILL AND INTANGIBLE ASSETS (Details Textual) - USD ($) $ in Thousands	1 Months Ended				3 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	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
GOODWILL AND INTANGIBLE ASSETS
Amortization of Intangible Assets					$ 7,900	$ 6,800	$ 15,800	$ 13,200
Payments to Acquire Intangible Assets							5,169	$ 50,956
Goodwill			$ 1,838		1,838		1,838		$ 1,838
Finite-Lived Intangible Assets, Gross	$ 1,000		284,716		$ 288,215		$ 288,215		284,716
Acquired Finite-lived Intangible Asset, Amortization Description							we are amortizing 80% of the value of the intangible assets over the first five years of useful lives of the assets and amortizing the remaining 20% of the value of the intangible assets over the second five years of useful lives of the assets.
Inderal XL [Member]
GOODWILL AND INTANGIBLE ASSETS
Finite-Lived Intangible Asset, Useful Life				10 years
Finite-Lived Intangible Assets, Gross				$ 15,100
Acquisition Costs Capitalized				40
Asset Acquisition Purchase Price				$ 20,200
InnoPran XL [Member]
GOODWILL AND INTANGIBLE ASSETS
Finite-Lived Intangible Asset, Useful Life				10 years
Finite-Lived Intangible Assets, Gross				$ 19,000
Acquisition Costs Capitalized				100
Asset Acquisition Purchase Price				30,600
InnoPran XL [Member] | Line of Credit [Member]
GOODWILL AND INTANGIBLE ASSETS
Payments to Acquire Intangible Assets				30,000
InnoPran XL [Member] | Cash [Member]
GOODWILL AND INTANGIBLE ASSETS
Payments to Acquire Intangible Assets				$ 600
Abbreviated New Drug Applications [Member] | IDT Australia, Limited [Member]
GOODWILL AND INTANGIBLE ASSETS
Payments to Acquire Intangible Assets		$ 2,700
Finite-Lived Intangible Asset, Useful Life		10 years
Finite-Lived Intangible Assets, Gross		$ 2,500
Acquisition Costs Capitalized		$ 18
Abbreviated New Drug Applications [Member] | Impax Laboratories, Inc. [Member]
GOODWILL AND INTANGIBLE ASSETS
Payments to Acquire Intangible Assets	$ 2,300
Finite-Lived Intangible Asset, Useful Life	10 years
Finite-Lived Intangible Assets, Gross	$ 1,000
Acquisition Costs Capitalized	$ 100
AstraZeneca AB and AstraZeneca UK Limited [Member] | New Drug Applications [Member]
GOODWILL AND INTANGIBLE ASSETS
Payments to Acquire Intangible Assets			$ 46,500						$ 46,500
Finite-Lived Intangible Asset, Useful Life			10 years						10 years
Finite-Lived Intangible Assets, Gross			$ 46,700						$ 46,700
Acquisition Costs Capitalized			$ 200