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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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The number of generic drug products.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount of cash outflow for fees classified as other.

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The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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FAIR VALUE DISCLOSURES - Acquired (Details) $ in Thousands	1 Months Ended		3 Months Ended		12 Months Ended
FAIR VALUE DISCLOSURES - Acquired (Details) $ in Thousands	Jul. 31, 2020 USD ($)	Jan. 31, 2020 USD ($) product	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Payments to acquire intangible assets			$ 39	$ 56,007
Gross carrying amount			355,170		$ 355,170
Useful life of intangible assets					9 years 4 months 24 days
Research and development			2,968	6,344
Intangible asset impairment charge			0	0
Amortization of intangible assets			9,700	10,000
Inventories, net			59,927		$ 60,803
Raw materials			39,746		41,591
Finished goods			21,791		20,363
Acquired in-process research and development ("IPR&D")			0	3,753
Acquired ANDA intangible assets
Gross carrying amount			$ 106,415		106,415
Useful life of intangible assets			8 years 9 months 18 days
Marketing and distribution rights
Gross carrying amount			$ 17,157		$ 17,157
Useful life of intangible assets			5 years 8 months 12 days
Private Company [Member]
Total asset purchase	$ 4,300
Transaction costs	100
Gross carrying amount	$ 3,000
Useful life of intangible assets	7 years
Intangible asset impairment charge			$ 0
Inventories, net	$ 1,400
Amerigen Pharmaceuticals, Ltd.
Number of generic products \| product		23
Total asset purchase		$ 56,800
Transaction costs		700
Contingent liability not recognized		$ 25,000
Period of contingent payments		4 years
Useful life of intangible assets		7 years
Research and development		$ 3,800
Intangible asset impairment charge			$ 0
Inventories, net		8,400
Raw materials		1,700
Finished goods		$ 6,700
Amerigen Pharmaceuticals, Ltd. \| Revolver [Member]
Proceeds from borrowing				$ 15,000
Amerigen Pharmaceuticals, Ltd. \| Discount rate
Fair values inputs discount rate		8.00%
Amerigen Pharmaceuticals, Ltd. \| Acquired ANDA intangible assets
Gross carrying amount		$ 38,500
Amerigen Pharmaceuticals, Ltd. \| Marketing and distribution rights
Gross carrying amount		$ 6,700