Share-Based Compensation Expense - Estimated Share-based Compensation Expense Related to Equity Awards Granted to Employees and Non-employee Directors (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | |
---|---|---|
Mar. 31, 2015
|
Mar. 31, 2014
|
|
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||
Share-based compensation expense | $ 1,066 | $ 399 |
Selling, General and Administrative Expense [Member] | ||
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||
Share-based compensation expense | 941 | 340 |
Research and Development Expense [Member] | ||
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||
Share-based compensation expense | $ 125 | $ 59 |