Annual report pursuant to Section 13 and 15(d)

ORGANIZATION, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregation of Revenue (Details)

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ORGANIZATION, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregation of Revenue (Details)
12 Months Ended
Dec. 31, 2020
Leasehold improvements | Minimum  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 3 years
Leasehold improvements | Maximum  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 10 years
Office equipment and aoftware | Minimum  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 3 years
Office equipment and aoftware | Maximum  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 7 years
Equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 5 years
Equipment | Maximum  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 10 years