BUSINESS DEVELOPMENT - Business Combination, Narrative (Details) - Arkis - USD ($)	Jul. 29, 2019	Dec. 31, 2019
Business Acquisition [Line Items]
Purchase price of business combination	$ 30,900,000
Contingent consideration, liability (up to)	25,500,000
Contingent consideration, fair value	$ 13,100,000	$ 13,200,000
Acquired intangible assets, discount rate	14.50%
Development Milestones
Business Acquisition [Line Items]
Contingent consideration, liability (up to)	$ 10,000,000.0
Commercial Sales Milestones
Business Acquisition [Line Items]
Contingent consideration, liability (up to)	$ 15,500,000

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Amount of liability recognized arising from contingent consideration in a business combination.

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