Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Additional Information (Detail)

v3.8.0.1
Stock-based Compensation - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 22, 2017
May 04, 2017
Feb. 09, 2017
Feb. 15, 2016
Jun. 30, 2016
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                              
Stock option awards             0       0     1,056,000 700,000
Weighted-average grant date fair value             $ 0.00       $ 0.00     $ 0.37 $ 0.72
Stock options vested                           386,666  
Stock options forfeited                           71,200  
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]                              
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                              
Number of additional shares available for issuance under stock option plan   1,500,000                          
2012 Equity Incentive Plan [Member] | Non-employee Directors [Member]                              
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                              
Stock option awards 140,000     80,000                      
Exercise price $ 0.37     $ 0.84                      
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 to each non-employee director     40,000 40,000                      
Restricted shares vest in each quarter end             10,000 10,000 10,000 10,000 10,000 10,000 10,000 30,000  
Restricted shares ending date                           Under the Company's 2012 Equity Incentive Plan of which, 10,000 restricted shares vest at the end of each calendar quarter in 2017, provided the recipient remains a director through the vesting date.  
2012 Equity Incentive Plan [Member] | Former Director [Member] | Restricted Stock [Member]                              
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                              
Restricted shares vest in each quarter end         20,000                    
2012 Equity Incentive Plan [Member] | Management [Member]                              
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                              
Stock option awards 455,000                            
Exercise price $ 0.37                            
2012 Equity Incentive Plan [Member] | Staff [Member]                              
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                              
Stock option awards 41,000                            
Exercise price $ 0.37                            
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