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Share-Based Payments - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 01, 2015
Dec. 31, 2013
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Feb. 06, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares outstanding, period     1,932,489   1,932,489   1,438,528  
Unrecognized compensation expense     $ 400,000   $ 400,000      
Stock options granted         799,828      
Allocated share-based compensation expense     0 $ 272,000 $ 0 $ 293,000    
Total unrecognized compensation cost related to non-vested stock options and unvested restricted stock     $ 4,800,000   $ 4,800,000      
Total unrecognized compensation cost related to non-vested stock options and unvested restricted stock, recognition period         2 years 5 months 23 days      
Non-Employee Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period     5,360 3,000 6,660      
Shares outstanding, period     4,467 2,500 4,467 2,500    
Restricted stock, issued           3,000    
Allocated share-based compensation expense     $ 5,000 $ 10,000 $ 37,000 $ 58,000    
Non-employee Restricted Stock Units [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock, issued     0 0 0 0    
Employees and Directors Stock Option and Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Allocated share-based compensation expense     $ 602,000 $ 427,000 $ 1,700,000 $ 1,100,000    
Non-employee Stock Options [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Allocated share-based compensation expense         $ 149,000 $ 759,000    
Expense related to options granted to non-employees     $ 22,000 $ 371,000        
2009 Stock Incentive Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percentage of fair value exercise price grant date of incentive stock options granted to 10% shareholder employees         110.00%      
Award vesting period         4 years      
Expected term (in years)         10 years      
Stock incentive plan, reserved shares of common stock   1,347,821            
Stock incentive plan, shares remained available for future issuance   1,586            
2009 Stock Incentive Plan [Member] | Cliff for New Employee [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period         1 year      
Stock Incentive Plan 2014 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock incentive plan, reserved shares of common stock   708,661            
Stock incentive plan, annual increase in reserved shares of common stock 722,331 1,102,362            
Stock incentive plan, annual increase in reserved shares as percentage of outstanding common stock   4.00%            
2014 Employee Stock Purchase Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Employee Stock Ownership Plan (ESOP), Shares in ESOP               157,480