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DEBT (Details) - USD ($)
$ in Millions
1 Months Ended
Apr. 30, 2020
Dec. 31, 2021
Feb. 28, 2018
Comerica | Line of credit      
DEBT      
Maximum borrowing capacity $ 10.0    
Outstanding borrowings   $ 0.0  
Comerica | Line of credit | Base (prime) rate | Minimum      
DEBT      
Percentage to be subtracted to compute the variable rate on the debt instrument 1.00%    
Comerica | Line of credit | Base (prime) rate | Maximum      
DEBT      
Percentage to be subtracted to compute the variable rate on the debt instrument 1.50%    
Comerica | Line of credit | London Interbank Offered Rates | Minimum      
DEBT      
Percentage that needs to be added to compute the variable rate on the debt instrument 1.25%    
Comerica | Line of credit | London Interbank Offered Rates | Maximum      
DEBT      
Percentage that needs to be added to compute the variable rate on the debt instrument 1.75%    
Comerica | Standby letters of credit      
DEBT      
Maximum borrowing capacity $ 4.0    
Amount outstanding   0.0  
Comerica | Standby letters of credit | Minimum      
DEBT      
Fee (as a percent) 1.00%    
Comerica | Standby letters of credit | Maximum      
DEBT      
Fee (as a percent) 1.50%    
HSBC China | Line of credit      
DEBT      
Maximum borrowing capacity     $ 15.0
Amount outstanding   $ 5.8  
Interest rate (as a percent)   5.50%