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LOSS PER SHARE (Details) - shares
3 Months Ended
Sep. 27, 2021
Dec. 31, 2021
Dec. 31, 2020
Employee stock options      
LOSS PER SHARE      
Shares excluded in computing diluted (loss)   1,654,270 704,340
Shares issuable upon conversion 3,040,268    
Common shares issuable upon conversion of preferred shares      
LOSS PER SHARE      
Shares excluded in computing diluted (loss)     12