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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Product Revenues and Service revenues (Details)
 12 Months Ended
Dec. 31, 2019
item
Product revenues  
Number of Drug Mall 1
Warranty period 30 days
Minimum percentage of surcharges and value added tax 0.00%
Maximum percentage of surcharges and value added tax 17.00%
Service revenues  
Number of performance obligation 1