Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Segment (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Segment (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
segment
Dec. 31, 2020
USD ($)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Number of reporting segment 1  
Number of Operating Segments 1  
Goodwill impairment charges | $ $ 0 $ 0