Change in Method of Accounting for Stock-based Compensation - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended | |
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Sep. 30, 2014
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Sep. 30, 2014
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Dec. 31, 2013
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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
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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
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |||
Accumulated deficit | $ 3,192,000 |