SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Accounts Receivable (Details) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2022 USD ($) Customer	Dec. 31, 2021 USD ($) Customer
Accounts Receivable [Abstract]
Accounts receivable, allowances for contractual credits and doubtful accounts \| $	$ 0.1	$ 0.2
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Six Customers [Member]
Accounts Receivable [Abstract]
Number of customers	4
Percentage of account receivables	92.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Three Customers [Member]
Accounts Receivable [Abstract]
Number of customers		3
Percentage of account receivables		94.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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