|
Convertible Senior Notes - Schedule of Total Interest Expense Recognized (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended |
|---|---|
|
Mar. 31, 2015
|
|
| Debt Disclosure [Abstract] | |
| 0.125% coupon | $ 126 |
| Amortization of debt issuance costs | 13 |
| Amortization of debt discount | 4,508 |
| Total | $ 4,647 |