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Stock-Based Compensation - Stock Option Activity (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Number of Shares, Beginning balance 302,729 428,258 447,359  
Number of Shares, Granted 2,595,000 0 0  
Number of Shares, Exercised 0 0 3,452  
Number of Shares, Cancelled (forfeited and expired) (818,600) (125,529) (15,649)  
Number of Shares, Ending balance 2,079,129 302,729 428,258 447,359
Weighted-average exercise price, Beginning balance $ 18.18 $ 19.97 $ 19.59  
Number of Shares, Exercisable 399,129      
Weighted-average exercise price, Granted $ 0.69      
Number of Shares, Vested and expected to vest 1,873,521      
Weighted-average exercise price, Exercised     1.00  
Weighted-average exercise price, Cancelled (forfeited and expired) $ 1.57 24.30 13.06  
Weighted-average exercise price, Ending balance 2.89 $ 18.18 $ 19.97 $ 19.59
Aggregate Intrinsic Value, Beginning balance     $ 2,175  
Weighted-Average Exercise Price, Exercisable 12.14      
Aggregate Intrinsic Value, Exercised     $ 2,214  
Weighted-Average Exercise Price, Vested and expected to vest $ 3.134      
Aggregate Intrinsic Value, Ending balance $ 1,800     $ 2,175
Weighted-Average Remaining Contractual Term, Outstanding 8 years 7 months 6 days 3 years 3 months 18 days 4 years 3 months 18 days 5 years 1 month 6 days
Aggregate Intrinsic Value, Exercisable $ 360      
Weighted-Average Remaining Contractual Term, Exercisable 4 years 10 months 24 days      
Aggregate Intrinsic Value, Vested and expected to vest $ 1,620      
Weighted-Average Remaining Contractual Term, Vested and expected to vest 8 years 6 months