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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Oct. 31, 2020	Dec. 31, 2020	Mar. 20, 2020
Fortis
Loss Contingencies [Line Items]
Loss contingency, damages sought	$ 30.0
Hong Kong Pharma Tainuo Ltd. | Flexion
Loss Contingencies [Line Items]
Proceeds from development and commercialization of ZILRETTA		$ 10.0
Maximum milestone payment to be received			$ 32.5

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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