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Stock-Based Compensation - Additional Information (Detail)
3 Months Ended 12 Months Ended
Sep. 03, 2013
Mar. 31, 2014
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Dec. 31, 2011
shares
Dec. 31, 2009
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                
Share-based compensation arrangement by share-based payment award, options, grants in period, gross     4,407,758              
Stock-based compensation | $     $ 3,311,000 $ 1,840,000 $ 941,000          
Share-based compensation arrangement by share-based payment award, options, outstanding, intrinsic value | $     3,800,000              
Share-based compensation arrangement by share-based payment award, options, exercisable, intrinsic value | $     3,300,000              
Share-based compensation arrangement by share-based payment award, options, vested and expected to vest, outstanding, aggregate intrinsic value | $     3,800,000              
Employee service share-based compensation, nonvested awards, Compensation cost not yet recognized, total | $     $ 6,081,000              
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition     3 years 1 month 6 days              
Merger Agreement [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stockholders equity note, stock split, conversion ratio 1.1533                  
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    
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     4,407,758 2,422,309 603,139          
Share-based compensation arrangement by share-based payment award, options, exercises in period, intrinsic value | $     $ 1,603,000 $ 996,000 $ 348,000          
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value | $ / shares     $ 1.37 $ 2.87 $ 0.95          
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  
Incentive Compensation Plan 2007 [Member] | Other Stock Based Awards [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          
Incentive Compensation Plan 2007 [Member] | Stock Appreciation Rights (SARs) [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          
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      
Stock appreciation rights maximum term     10 years