CONCENTRATION OF RISK - Additional Information (Details) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2016
USD ($)
|
Sep. 30, 2015
USD ($)
|
Sep. 30, 2016
USD ($)
supplier
|
Sep. 30, 2015
USD ($)
|
|
| Concentration Risk [Line Items] | ||||
| Revenue | $ 30,214,000 | $ 39,419,000 | $ 124,309,000 | $ 128,734,000 |
| 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 | $ 32,000 | $ 67,000 | $ 148,000 | $ 110,000 |
| 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) | 95.00% | 99.00% | 98.00% | 99.00% |