Major Customers Data as Percentage of Total Revenues (Detail) - Revenue - Customer Concentration Risk |
12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|||||
| Customer A | |||||||
| Revenue, Major Customer [Line Items] | |||||||
| Percentage of total revenues | 27.00% | 31.00% | 25.00% | ||||
| Customer B | |||||||
| Revenue, Major Customer [Line Items] | |||||||
| Percentage of total revenues | 19.00% | 0.00% | [1] | 0.00% | [1] | ||
| |||||||