Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Computation of Earnings per Share (Detail)

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Summary of Significant Accounting Policies - Computation of Earnings per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Basic:        
Net loss $ (5,961) $ (1,307) $ (19,195) $ (6,159)
Accretion to redemption value of redeemable convertible preferred stock   (3,036)   (9,289)
Reduction in redeemable convertible preferred stock distribution entitlement upon extinguishment   313,933   313,933
Amounts allocated to participating redeemable convertible preferred stock   (266,720)   (282,007)
Net (loss) income allocated to common stock-basic (5,961) 42,870 (19,195) 16,478
Weighted average number of common stock shares outstanding-basic 13,468,081 101,358 11,148,695 38,027
Net (loss) income per share-basic: $ (0.44) $ 422.95 $ (1.72) $ 433.33
Diluted:        
Net (loss) income allocated to common stock (5,961) 42,870 (19,195) 16,478
Adjustments from assumed conversion of redeemable convertible preferred stock   (44,177)   (22,637)
Net loss allocated to common stock-diluted $ (5,961) $ (1,307) $ (19,195) $ (6,159)
Total common stock equivalent shares 13,468,081 731,970 11,148,695 688,825
Net loss per share-diluted $ (0.44) $ (1.79) $ (1.72) $ (8.94)
Common Stock [Member]
        
Diluted:        
Total common stock equivalent shares 13,468,081 101,358 11,148,695 38,027
Preferred Stock [Member]
        
Diluted:        
Total common stock equivalent shares   630,612   650,798