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BUSINESS DEVELOPMENT - Business Combination, Narrative (Details) - Arkis	Jul. 29, 2019 USD ($)
Business Acquisition [Line Items]
Purchase price of business combination	$ 30,600,000
Contingent consideration, liability (up to)	25,500,000
Contingent consideration, fair value	$ 13,100,000
Acquired intangible assets, discount rate	14.50%
Development Milestones
Business Acquisition [Line Items]
Contingent consideration, liability (up to)	$ 10,000,000
Commercial Sales Milestones
Business Acquisition [Line Items]
Contingent consideration, liability (up to)	$ 15,500,000

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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