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DESCRIPTION OF BUSINESS (Details)	9 Months Ended
	Sep. 30, 2021 product segment $ / shares	Oct. 22, 2021 $ / shares shares	Dec. 31, 2020 $ / shares
Concentration Risk [Line Items]
Flexion common stock, par value	$ 0.001		$ 0.001
Number of reportable segments | segment	1
Flexion | Subsequent Event
Concentration Risk [Line Items]
Flexion common stock, par value		$ 0.001
Offer price, per Flexion Share		$ 8.5
Contingent value right, per Flexion Share | shares		1
Additional contingent payment, share price		$ 8.00
Sales Revenue, Net | Product Concentration Risk
Concentration Risk [Line Items]
Concentration of products (in products) | product	2

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Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

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Face amount or stated value per share of common stock.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
-Topic 280
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-Section 50
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