DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Credit Risk and Significant Customers (Details) - Customer Concentration Risk |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
Dec. 31, 2016 |
|
| VAD A | Sales | |||||
| Revenue, Major Customer [Line Items] | |||||
| Significant customer, as a percentage | 17.30% | 14.00% | 15.40% | 13.80% | |
| VAD A | Accounts Receivable | |||||
| Revenue, Major Customer [Line Items] | |||||
| Significant customer, as a percentage | 23.50% | 22.40% | |||
| VAD B | Sales | |||||
| Revenue, Major Customer [Line Items] | |||||
| Significant customer, as a percentage | 36.90% | 19.20% | 24.60% | 11.00% | |
| VAD B | Accounts Receivable | |||||
| Revenue, Major Customer [Line Items] | |||||
| Significant customer, as a percentage | 27.50% | 14.40% | |||
| VAD C [Member] | Accounts Receivable | |||||
| Revenue, Major Customer [Line Items] | |||||
| Significant customer, as a percentage | 0.00% | 15.30% | |||