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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Estimated useful lives of assets (Details)
12 Months Ended
Dec. 31, 2019
Building  
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Estimated useful lives of assets 30 years
Building improvements | Minimum  
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Estimated useful lives of assets 5 years
Building improvements | Maximum  
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Estimated useful lives of assets 20 years
Furniture and Fixtures  
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Estimated useful lives of assets 5 years
Computer, office & manufacturing equipment  
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Estimated useful lives of assets 3 years
Purchased software  
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Estimated useful lives of assets 3 years