SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair Value of Financial Instruments (Details) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2022	Dec. 31, 2021
Liabilities, Fair Value Disclosure [Abstract]
Warrant liability	$ 12,253	$ 18,223
Contingent consideration	13,379,797	12,179,476
Derivative liability	2,664,171	2,294,720
Total	16,056,221	14,492,419
Warrant Liability
Outstanding as of December 31, 2021	18,223
Change in fair value	1,200,321
Outstanding as of March 31, 2022	12,253	18,223
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Outstanding as of December 31, 2021	12,179,476
Change in fair value	1,200,321
Outstanding as of March 31, 2022	13,379,797	12,179,476
Level 2
Liabilities, Fair Value Disclosure [Abstract]
Warrant liability	12,253	18,223
Total	12,253	18,223
Level 3
Liabilities, Fair Value Disclosure [Abstract]
Contingent consideration	13,379,797	12,179,476
Derivative liability	2,664,171	2,294,720
Total	$ 16,043,968	$ 14,474,196

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Fair value at acquisition-date of the assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interests issued by the acquirer, including but not limited to, instruments or interests issued or issuable in consideration for the business combination.

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

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount that would be paid, determined under the conditions specified in the contract, if the holder of the share has the right to redeem the shares.

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The fair value of shares that would be issued, determined under the conditions specified in the contract if the settlement were to occur at the reporting date.

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