SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Foreign currency translation (Details)	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Balance sheet items, except for equity accounts	6.7908		7.0170
Items in the statements of operations and comprehensive loss	6.9195	6.9209
Items in the statements of operations and comprehensive loss, and statements of cash flows	7.0005	6.8237