Segment Information and Geographic Information - Additional Information (Detail) - Segment |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Segment Reporting Information [Line Items] | |||
| Number of operating segment | 1 | ||
| United States [Member] | |||
| Segment Reporting Information [Line Items] | |||
| Percentage of net revenues | 96.00% | 96.00% | 96.00% |