Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Additional Information (Detail)

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Stock-based Compensation - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 16, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Stock option awards   10,000 100,000 910,000 100,000
Weighted-average grant date fair value   $ 0.77 $ 2.81 $ 1.29 $ 2.81
Stock options vested       28,333  
Stock options forfeited       278,334  
Number of stock options, exercised       0  
Non- employee Directors [Member]          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Annual retainer amount for the threshold of stock precluded from selling       $ 270,000  
2012 Equity Incentive Plan [Member] | Chief Financial Officer [Member]          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Stock option awards 200,000        
Exercise price of plan $ 1.32        
Vesting period 3 years        
2012 Equity Incentive Plan [Member] | Non- employee Directors [Member]          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Stock option awards 80,000        
Exercise price of plan $ 1.32        
2012 Equity Incentive Plan [Member] | Non- employee Directors [Member] | Restricted Stock [Member]          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Restricted shares awarded 40,000        
Restricted shares ending date       Under the Company's 2012 Plan, of which 10,000 restricted shares vest at the end of each calendar quarter in 2015, provided the recipient remains a director through the vesting date.  
Restricted shares vest in each quarter end   10,000   20,000  
Operations Or Product Development [Member] | 2012 Equity Incentive Plan [Member] | Senior Vice President [Member]          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Stock option awards 150,000        
Exercise price of plan $ 1.32        
Vesting period 3 years        
Discovery Research [Member] | 2012 Equity Incentive Plan [Member] | Senior Vice President [Member]          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Stock option awards 150,000        
Exercise price of plan $ 1.32        
Vesting period 3 years