Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Additional Information (Detail)

v3.3.0.814
Stock-Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
May. 11, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for future issuance 7,629,357   7,629,357    
Intrinsic value of outstanding exercisable options $ 0   $ 0    
Options issued 0   0    
Options exercised 0   0    
Options forfeited 0   0    
Options vested     11,667    
Options Expired     99,546    
Stock-based compensation expenses $ 919,000 $ 227,000 $ 2,082,000 $ 588,000  
2013 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for future issuance 2,423,519   2,423,519    
Shares awarded for incentive compensation     831,150    
2013 Plan | Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options awarded, cumulative grants under the Plan 35,000   35,000    
2013 Plan | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted shares, cumulative awards under the Plan 2,745,331   2,745,331    
2013 Plan | After giving effect to the May 2015 amendment          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for future issuance 2,423,519   2,423,519    
2013 Plan | Before Amendment          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common shares authorized to be issued         6,000,000
2013 Plan | Equity Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock awards vesting periods     3 years    
2013 Plan | Equity Option | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options exercise price, percentage     100.00%    
2013 Plan | Equity Option | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grant expiration period     10 years    
2003 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares of common stock vested and exercisable 279,834   279,834    
Common shares authorized to be issued 279,834   279,834