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COMMITMENTS AND CONTINGENCIES - Legal Matters (Details) - USD ($)
$ in Thousands
Sep. 21, 2015
Aug. 11, 2015
Jan. 31, 2016
Legal Matters      
Settlement amount   $ 4,945  
Effective period 3 years    
Estimated aggregate potential loss, minimum     $ 0
Estimated aggregate potential loss, maximum     $ 15,000