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Stockholders' Equity - Summary of Stock Options Outstanding and Exercisable (Detail) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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) 1,008,000 1,103,000 1,641,000 3,366,000
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 5.40 $ 5.37 $ 5.26 $ 6.15
Number of Options Exercisable (in shares) 977,000 1,072,000 1,606,000  
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 5.42 $ 5.39 $ 5.27  
Stock Options | Range One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Options Outstanding (in shares) 722,000      
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 4.65      
Options Outstanding, Weighted Average Remaining Contractual Life 2 years 7 months 28 days      
Number of Options Exercisable (in shares) 691,000      
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 4.64      
Options Exercisable, Weighted Average Remaining Contractual Life 2 years 8 months 9 days      
Stock Options | Range Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Options Outstanding (in shares) 112,000      
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 5.57      
Options Outstanding, Weighted Average Remaining Contractual Life 1 year 8 months 12 days      
Number of Options Exercisable (in shares) 112,000      
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 5.57      
Options Exercisable, Weighted Average Remaining Contractual Life 1 year 8 months 12 days      
Stock Options | Range Three        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Options Outstanding (in shares) 106,000      
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 7.25      
Options Outstanding, Weighted Average Remaining Contractual Life 1 year 2 months 9 days      
Number of Options Exercisable (in shares) 106,000      
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 7.25      
Options Exercisable, Weighted Average Remaining Contractual Life 1 year 2 months 9 days      
Stock Options | Range Four        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Options Outstanding (in shares) 68,000      
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 10.30      
Options Outstanding, Weighted Average Remaining Contractual Life 4 months 24 days      
Number of Options Exercisable (in shares) 68,000      
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 10.30      
Options Exercisable, Weighted Average Remaining Contractual Life 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) 1,008,000      
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 5.40      
Options Outstanding, Weighted Average Remaining Contractual Life 2 years 3 months      
Number of Options Exercisable (in shares) 977,000      
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 5.42      
Options Exercisable, Weighted Average Remaining Contractual Life 2 years 3 months