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Stockholders' Equity - Summary of Stock Options Outstanding and Exercisable (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Range One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Range of exercise price, Lower limit (in dollars per share) $ 4.00      
Range of exercise price, Upper limit (in dollars per share) 5.00      
Range Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Range of exercise price, Lower limit (in dollars per share) 5.01      
Range of exercise price, Upper limit (in dollars per share) 7.00      
Range Three        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Range of exercise price, Lower limit (in dollars per share) 7.01      
Range of exercise price, Upper limit (in dollars per share) 10.00      
Range Four        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Range of exercise price, Lower limit (in dollars per share) 10.01      
Range of exercise price, Upper limit (in dollars per share) 16.23      
Range Five        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Range of exercise price, Lower limit (in dollars per share) 4.00      
Range of exercise price, Upper limit (in dollars per share) $ 16.23      
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of options outstanding (in shares) 1,102,745 1,641,083 3,365,692 6,321,076
Options outstanding, Weighted average exercise price (in dollars per share) $ 5.37 $ 5.26 $ 6.15 $ 6.05
Number of options exercisable (in shares) 1,072,145 1,605,789 3,217,146  
Options exercisable, Weighted average exercise price (in dollars per share) $ 5.39 $ 5.27 $ 6.22  
Stock Options | Range One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of options outstanding (in shares) 783,598      
Options outstanding, Weighted average exercise price (in dollars per share) $ 4.64      
Options outstanding, Weighted average remaining contractual life 3 years 8 months 23 days      
Number of options exercisable (in shares) 752,998      
Options exercisable, Weighted average exercise price (in dollars per share) $ 4.63      
Options exercisable, Weighted average remaining contractual life 3 years 9 months 4 days      
Stock Options | Range Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of options outstanding (in shares) 137,936      
Options outstanding, Weighted average exercise price (in dollars per share) $ 5.58      
Options outstanding, Weighted average remaining contractual life 2 years 11 months 12 days      
Number of options exercisable (in shares) 137,936      
Options exercisable, Weighted average exercise price (in dollars per share) $ 5.58      
Options exercisable, Weighted average remaining contractual life 2 years 11 months 12 days      
Stock Options | Range Three        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of options outstanding (in shares) 113,322      
Options outstanding, Weighted average exercise price (in dollars per share) $ 7.24      
Options outstanding, Weighted average remaining contractual life 2 years 2 months 12 days      
Number of options exercisable (in shares) 113,322      
Options exercisable, Weighted average exercise price (in dollars per share) $ 7.24      
Options exercisable, Weighted average remaining contractual life 2 years 2 months 12 days      
Stock Options | Range Four        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of options outstanding (in shares) 67,889      
Options outstanding, Weighted average exercise price (in dollars per share) $ 10.30      
Options outstanding, Weighted average remaining contractual life 1 year 4 months 24 days      
Number of options exercisable (in shares) 67,889      
Options exercisable, Weighted average exercise price (in dollars per share) $ 10.30      
Options exercisable, Weighted average remaining contractual life 1 year 4 months 24 days      
Stock Options | Range Five        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of options outstanding (in shares) 1,102,745      
Options outstanding, Weighted average exercise price (in dollars per share) $ 5.37      
Options outstanding, Weighted average remaining contractual life 3 years 3 months 29 days      
Number of options exercisable (in shares) 1,072,145      
Options exercisable, Weighted average exercise price (in dollars per share) $ 5.39      
Options exercisable, Weighted average remaining contractual life 3 years 4 months 2 days