Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Additional Information (Detail)

v3.2.0.727
Stock-Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
May. 11, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for future issuance 8,016,420   8,016,420    
Intrinsic value of outstanding exercisable options $ 0   $ 0    
Options issued 0   0    
Options exercised 0   0    
Options forfeited 0   0    
Options vested 0   0    
Options Expired 0   0    
Stock-based compensation expenses $ 629,000 $ 229,000 $ 1,163,000 $ 361,000  
2013 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for future issuance 2,288,519   2,288,519    
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 2,880,331   2,880,331    
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 2,288,519   2,288,519    
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 379,380   379,380    
Common shares authorized to be issued 379,380   379,380