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FAIR VALUE DISCLOSURES - Additional information (Details)
1 Months Ended 3 Months Ended
Jan. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
product
Mar. 31, 2019
USD ($)
item
Jan. 31, 2019
USD ($)
May 31, 2018
USD ($)
item
Apr. 30, 2018
USD ($)
item
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 27, 2018
USD ($)
Payments to Acquire Intangible Assets             $ 56,007,000     $ 18,510,000    
Goodwill, Impairment Loss             0     0    
Research and Development Expense             6,344,000     4,373,000    
Intangible asset impairment charge             0     0    
Finite-Lived Intangible Assets, Gross             352,489,000 $ 307,225,000        
Inventory, Raw Materials, Gross             35,340,000 34,881,000        
Research and Development in Process             3,753,000     0    
Inventory, Finished Goods, Gross             20,835,000 16,750,000        
Appco Pharma, LLC [Member]                        
Intangible asset impairment charge               75,000        
Finite-Lived Intangible Assets, Gross                 $ 80,000      
Finite-Lived Intangible Asset, Useful Life                 8 years      
Pharmaceutics International, Inc and BAS ANDA LLC [Member]                        
Payments to Acquire Intangible Assets               $ 500,000        
Finite-Lived Intangible Asset, Useful Life               10 years        
Senior Secured Credit Facility [Member] | Delayed Draw Term Loan [Member]                        
Long-term Debt, Gross             118,000,000          
Milestone Two [Member] | Appco Pharma, LLC [Member]                        
Payments to Acquire Intangible Assets                 $ 80,000      
Interest rate swap [Member] | Delayed Draw Term Loan [Member]                        
Derivative Asset, Notional Amount             118,000,000          
Interest Rate Derivative Liabilities, at Fair Value             8,400,000          
IDT Australia Limited [Member] | Abbreviated New Drug Applications [Member] | Maximum                        
Fair Values Inputs Discount Rate           15.00%            
IDT Australia Limited [Member] | Abbreviated New Drug Applications [Member] | Minimum                        
Fair Values Inputs Discount Rate           10.00%            
IDT Australia Limited [Member] | Acquired New Drug Applications [Member]                        
Payments to Acquire Intangible Assets           $ 2,700,000            
Number Of Generic Drug Products Acquired | item           23            
Finite-Lived Intangible Asset, Useful Life           10 years            
Acquisition Costs Capitalized           $ 18,000            
Inventory, Raw Materials, Gross           200,000            
Impax Laboratories, Inc. [Member] | Equipment [Member]                        
Finite-Lived Intangible Assets, Gross         $ 58,000              
Finite-Lived Intangible Asset, Useful Life         5 years              
Impax Laboratories, Inc. [Member] | Abbreviated New Drug Applications [Member]                        
Payments to Acquire Intangible Assets         $ 2,300,000              
Number Of Generic Drug Products Acquired | item         2              
Finite-Lived Intangible Asset, Useful Life         10 years              
Acquisition Costs Capitalized         $ 100,000              
Contingent Consideration In An Asset Purchase         $ 10,000,000              
Impax Laboratories, Inc. [Member] | Abbreviated New Drug Applications [Member] | Maximum | Discount rate                        
Fair Values Inputs Discount Rate         15.00%              
Impax Laboratories, Inc. [Member] | Abbreviated New Drug Applications [Member] | Minimum | Discount rate                        
Fair Values Inputs Discount Rate         10.00%              
Impax Laboratories, Inc. [Member] | Milestone One [Member]                        
Contingent liability not recognized         $ 25,000,000              
Impax Laboratories, Inc. [Member] | Milestone Two [Member]                        
Contingent liability not recognized         15,000,000              
Amerigen Pharmaceuticals, Ltd.                        
Payments to Acquire Intangible Assets $ 56,800,000                      
Number of generic products 23                      
Period of contingent payments 4 years                      
Number of commercial products under product portfolio 10                      
Number of approved products with launches pending under product portfolio 3                      
Number of filed products under product portfolio 4                      
Number of in-development products under product portfolio 4                      
Number of approved products under product portfolio 2                      
Useful life 7 years                      
Research and Development Expense $ 3,800,000                      
Inventory recognized 8,400,000                      
Inventory recognized 1,700,000                      
Inventory recognized 6,700,000                      
Contingent liability not recognized 25,000,000                      
Contingent liability recognized             100,000          
Intangible asset impairment charge             0          
Finite-Lived Intangible Assets, Gross 38,500,000                      
Acquisition Costs Capitalized 700,000                      
Amerigen Pharmaceuticals, Ltd. | Cash [Member]                        
Payments to Acquire Intangible Assets $ 48,900,000                      
Amerigen Pharmaceuticals, Ltd. | Discount rate                        
Fair Values Inputs Discount Rate 8.00%                      
Fair Value, Inputs, Level 3 [Member] | IDT Australia Limited [Member] | Acquired New Drug Applications [Member]                        
Finite-Lived Intangible Assets, Gross           $ 2,500,000            
Fair Value, Inputs, Level 3 [Member] | Impax Laboratories, Inc. [Member] | Abbreviated New Drug Applications [Member]                        
Finite-Lived Intangible Assets, Gross         1,000,000              
Term Loan [Member] | Senior Secured Credit Facility [Member]                        
Long-term Debt, Gross             68,600,000       $ 72,200,000  
Term Loan [Member] | Interest rate swap [Member]                        
Derivative Asset, Notional Amount             68,600,000         $ 72,200,000
Interest Rate Derivative Liabilities, at Fair Value             5,000,000          
Acquired ANDA intangible assets                        
Finite-Lived Intangible Assets, Gross             $ 103,234,000 $ 64,704,000        
Finite-Lived Intangible Asset, Useful Life             8 years 10 months 24 days          
In Process Research and Development [Member] | Impax Laboratories, Inc. [Member]                        
Research and Development in Process         $ 1,300,000              
In Process Research and Development [Member] | Impax Laboratories, Inc. [Member] | Discount rate                        
Fair Values Inputs Discount Rate         75.00%              
Marketing and distribution rights                        
Finite-Lived Intangible Assets, Gross             $ 17,657,000 $ 10,923,000        
Finite-Lived Intangible Asset, Useful Life             5 years 8 months 12 days          
Marketing and distribution rights | Amerigen Pharmaceuticals, Ltd.                        
Finite-Lived Intangible Assets, Gross $ 6,700,000                      
Teva Pharmaceuticals [Member]                        
Payments to Acquire Intangible Assets       $ 16,000,000                
Fair Values Inputs Discount Rate       12.00%                
Cumulative Amortization Expense       $ 6,800,000                
Additional Net Carrying Value Added To Finite Lived Intangible Assets Acquired       $ 9,200,000                
Teva Pharmaceuticals [Member] | Acquired New Drug Applications [Member]                        
Number Of Generic Drug Products Acquired | item     35                  
Teva Pharmaceuticals [Member] | Acquired ANDA intangible assets                        
Payments to Acquire Intangible Assets     $ 2,500,000                  
Finite-Lived Intangible Assets, Gross     $ 2,500,000             $ 2,500,000    
Finite-Lived Intangible Asset, Useful Life     10 years                  
Acquisition Costs Capitalized     $ 10,000                  
Fair Values Inputs Discount Rate     15.00%                  
Coeptis Pharmaceuticals, Inc. [Member]                        
Number Of Generic Drug Products Acquired | product   7                    
Contingent Consideration In An Asset Purchase   $ 12,000,000                    
Research and Development in Process   2,300,000                    
Acquisition Costs Expensed   $ 24,000                    
Contingent Value Rights [Member] | Discount rate                        
Fair Values Inputs Discount Rate             15.00%