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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of credit risk (Details 2) - Accounts Receivable - Credit Concentration Risk
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Customer A    
Concentration Risk [Line Items]    
Concentration risk, percentage 17.00% 1.00%
Customer B    
Concentration Risk [Line Items]    
Concentration risk, percentage 13.00% 7.00%
Customer C    
Concentration Risk [Line Items]    
Concentration risk, percentage 13.00% 1.00%
Customer D    
Concentration Risk [Line Items]    
Concentration risk, percentage 5.00% 26.00%
Customer E    
Concentration Risk [Line Items]    
Concentration risk, percentage 17.00%