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, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| VAD A | Sales | |||
| Revenue, Major Customer [Line Items] | |||
| Significant customer, as a percentage | 14.90% | 13.80% | 13.60% |
| VAD A | Accounts Receivable | |||
| Revenue, Major Customer [Line Items] | |||
| Significant customer, as a percentage | 22.40% | 18.50% | |
| VAD B | Sales | |||
| Revenue, Major Customer [Line Items] | |||
| Significant customer, as a percentage | 12.20% | ||
| VAD B | Accounts Receivable | |||
| Revenue, Major Customer [Line Items] | |||
| Significant customer, as a percentage | 14.40% | ||
| VAD C | Accounts Receivable | |||
| Revenue, Major Customer [Line Items] | |||
| Significant customer, as a percentage | 11.20% | ||
| VAD D | Accounts Receivable | |||
| Revenue, Major Customer [Line Items] | |||
| Significant customer, as a percentage | 15.30% | ||