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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Concentration of Credit Risk (Details) - Customer Concentration Risk [Member] - Three Customers [Member] - Customer	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue Benchmark [Member]
Concentration of Credit Risk [Abstract]
Number of major customers	3	3
Concentration of credit risk	60.10%	97.40%
Accounts Receivable [Member]
Concentration of Credit Risk [Abstract]
Number of major customers	3	3
Concentration of credit risk	77.30%	76.10%

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- References

No definition available.

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- Definition

Number of major customers who contributes 10% or more of entity's total revenue.

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Publisher FASB
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-Topic 275
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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