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Stock-Based Compensation - Additional Information (Detail)
12 Months Ended
Mar. 31, 2014
Sep. 03, 2013
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
shares
Dec. 31, 2011
shares
Dec. 31, 2009
shares
Jun. 08, 2016
shares
May 07, 2015
shares
Oct. 29, 2013
shares
Jun. 19, 2012
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stockholders equity note, stock split, conversion ratio 0.2   0.2                  
Share-based compensation arrangement by share-based payment award, options, grants in period, gross     5,368,755                  
Stock-based compensation | $     $ 5,033,000 $ 3,311,000 $ 1,840,000              
Expected dividend yield     0.00% 0.00% 0.00%              
Share-based compensation arrangement by share-based payment award, options, outstanding, intrinsic value | $     $ 1,300,000                  
Share-based compensation arrangement by share-based payment award, options, exercisable, intrinsic value | $     1,300,000                  
Share-based compensation arrangement by share-based payment award, options, vested and expected to vest, outstanding, aggregate intrinsic value | $     1,300,000                  
Employee service share-based compensation, nonvested awards, Compensation cost not yet recognized, total | $     $ 7,953,000                  
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition     2 years 10 months 24 days                  
Incentive Compensation Plan 2006 [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share-based compensation arrangement by share-based payment award, options, grants in period, gross     80,000       3,378,189 1,110,053        
Share-based compensation arrangement by share-based payment award, award vesting period     4 years                  
Stock appreciation rights maximum term     10 years                  
Stock Appreciation Rights (SARs) [Member] | Incentive Compensation Plan 2007 [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share-based compensation arrangement by share-based payment award, maximum number of shares per employee         1,000,000 200,000            
Other Stock Based Awards [Member] | Incentive Compensation Plan 2007 [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share-based compensation arrangement by share-based payment award, maximum number of shares per employee         500,000 100,000            
Unvested Options [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share-based compensation arrangement by share-based payment award, options, grants in period, gross     5,368,755 4,407,758 2,422,309              
Share-based compensation arrangement by share-based payment award, options, exercises in period, intrinsic value | $     $ 519,000 $ 1,603,000 $ 996,000              
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value | $ / shares     $ 1.30 $ 1.37 $ 2.87              
June 19, 2012 Amendment [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Common stock, capital shares reserved for future issuance                       1,000,000
October 29, 2013 Amendment [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Common stock, capital shares reserved for future issuance                     4,940,000  
May 7, 2015 Amendment [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Common stock, capital shares reserved for future issuance                   11,940,000    
June 8, 2016 Amendment [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Common stock, capital shares reserved for future issuance                 18,940,000      
Merger Agreement [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stockholders equity note, stock split, conversion ratio   1.1533