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Change in Method of Accounting for Stock-based Compensation - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Dec. 31, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accumulated deficit $ (357,703,000) $ (357,703,000) $ (308,170,000)
Change in Accounting for Amortization of Stock-Based Compensation Cost from Accelerated Attribution Method to Straight-Line Method
     
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on share based compensation 400,000 1,600,000  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income 400,000 1,600,000  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Earnings Per Share $ 0.01 $ 0.05  
Accumulated deficit     (308,170,000)
Change in Accounting for Amortization of Stock-Based Compensation Cost from Accelerated Attribution Method to Straight-Line Method | Retrospective Adjustment
     
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accumulated deficit     $ 3,192,000