DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Credit Risk and Significant Customers (Details) - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Foreign Customers | Sales
Revenue, Major Customer [Line Items]
Significant customer, as a percentage	38.00%	40.00%	39.00%
VAD A | Sales
Revenue, Major Customer [Line Items]
Significant customer, as a percentage	13.80%	13.60%	14.10%
VAD A | Accounts Receivable
Revenue, Major Customer [Line Items]
Significant customer, as a percentage	18.50%	18.80%
VAD B | Accounts Receivable
Revenue, Major Customer [Line Items]
Significant customer, as a percentage	11.20%