SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Financial information of revenues and net loss of OBON Thailand (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues	$ 962
Net loss	315,987	$ 500,685
Net cash provided by (used in) operating activities	35,500	(234,684)
Net cash used in investing activities		(438,009)
Net cash provided by financing activities	37,038	167,187
OBON Thailand
Revenues	962
Net loss	165,854	225,914
Net cash provided by (used in) operating activities	1,995	(79,789)
Net cash used in investing activities		$ (438,928)
Net cash provided by financing activities	$ 2,423