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Stockholders' Equity and Stock-Based Compensation - Summary of Compensation Expense Recognized Related to all Stock-Based Awards (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]        
Total stock-based compensation $ 962 $ 517 $ 1,528 $ 844