Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Additional Information (Detail)

v3.5.0.2
Stock-based Compensation - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 06, 2016
Feb. 16, 2016
Feb. 15, 2016
Mar. 16, 2015
Mar. 31, 2015
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                              
Stock option awards             0       0     700,000 910,000
Weighted-average grant date fair value             $ 0.00       $ 0.00     $ 0.72 $ 1.29
Stock options vested                           559,164  
Stock options forfeited                           574,758  
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  
Dr. Alan Joslyn [Member]                              
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                              
Stock option awards 300,000                            
Restricted shares ending date                           The Company issued (i) stock options to purchase 300,000 shares of the Company's common stock at an exercise price equal to $0.55 per share which stock options shall vest in six installments of 50,000 shares every six months after June 6, 2016, provided that he has continued his employment with the Company through such dates, and (ii) 30,000 shares of restricted stock of the Company, vesting in two installments on the six month and twelve month anniversaries of June 6, 2016.  
Exercise price of plan $ 0.55                            
Stock options non-vested 50,000                            
Dr. Alan Joslyn [Member] | Restricted Stock [Member]                              
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                              
Restricted shares non-vest in each quarter end 30,000                            
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     80,000                    
Exercise price of plan   $ 0.84   $ 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   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 2016, provided the recipient remained a director through the vesting date.  
Restricted shares vest in each quarter end             10,000 10,000 10,000 10,000 10,000 10,000 10,000 10,000  
2012 Equity Incentive Plan [Member] | Scenario, Forecast [Member] | Non-employee Directors [Member] | Restricted Stock [Member]                              
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                              
Restricted shares vest in each quarter end           10,000                  
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