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CONCENTRATION OF RISK - Additional Information (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
supplier
Jun. 30, 2016
USD ($)
Concentration Risk [Line Items]        
Revenue $ 102,513,000 $ 64,392,000 $ 158,079,000 $ 94,095,000
Supplier Concentration Risk [Member]        
Concentration Risk [Line Items]        
Number of suppliers from which chemical materials were purchased | supplier     1  
Total Revenue [Member] | Government Contracts Concentration Risk [Member]        
Concentration Risk [Line Items]        
Revenue $ 0 $ 59,000 $ 10,000 $ 116,000
Concentration risk, percentage (less than 1% for contracts with U.S. government agencies) 1.00% 1.00% 1.00% 1.00%
Total Revenue [Member] | Customer Concentration Risk [Member] | Excluding North America [Member]        
Concentration Risk [Line Items]        
Concentration risk, percentage (less than 1% for contracts with U.S. government agencies) 98.00% 99.00% 97.00% 99.00%