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CREDIT FACILITIES (Details)
1 Months Ended 6 Months Ended
Jun. 29, 2020
USD ($)
Jun. 06, 2018
USD ($)
Dec. 31, 2019
USD ($)
Aug. 02, 2020
USD ($)
Feb. 02, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Line of Credit Facility [Line Items]            
Short-term debt       $ 0    
Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Debt instrument, term     12 months      
Maximum borrowing capacity     $ 18,600,000     ¥ 130,000,000.0
Interest accrued rate as percentage of PBOC benchmark lending rate     105.00%      
Guarantees commission rate per annum of outstanding amount     1.00%     1.00%
Revolving Loan            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity     $ 14,300,000     ¥ 100,000,000.0
Financial Bank Guarantee Facility            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity     $ 4,300,000     ¥ 30,000,000.0
Line of Credit            
Line of Credit Facility [Line Items]            
Long-term line of credit       $ 0 $ 0  
Line of Credit | Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Debt instrument, term 364 days     5 years    
Maximum borrowing capacity $ 300,000,000.0 $ 400,000,000.0   $ 600,000,000.0    
Long-term line of credit       0    
Line of Credit | Letter of Credit            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity   50,000,000.0        
Long-term line of credit       $ 2,300,000    
Line of Credit | Swing Line Loan            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity   $ 50,000,000.0        
Line of Credit | Minimum | Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Commitment fee percentage   0.125%   0.10%    
Line of Credit | Minimum | Letter of Credit            
Line of Credit Facility [Line Items]            
Commitment fee percentage   1.00%   1.00%    
Line of Credit | Maximum | Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Commitment fee percentage   0.20%   0.20%    
Line of Credit | Maximum | Letter of Credit            
Line of Credit Facility [Line Items]            
Commitment fee percentage   1.75%   1.50%    
Line of Credit | LIBOR | Minimum | Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Basis spread on variable rate 1.50% 1.00%   1.00%    
Line of Credit | LIBOR | Maximum | Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Basis spread on variable rate 2.25% 1.75%   1.50%    
Line of Credit | Base Rate | Minimum | Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Basis spread on variable rate   0.00%   0.00%    
Line of Credit | Base Rate | Maximum | Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Basis spread on variable rate   0.75%   0.50%