Annual report pursuant to Section 13 and 15(d)

Stock Compensation Plan - Summary of Stock Option Activity (Detail)

v3.6.0.2
Stock Compensation Plan - Summary of Stock Option Activity (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Options, Outstanding, beginning balance 1,471,031 820,865
Number of Options, Forfeited (574,758) (278,334)
Number of Options, Granted 725,250 928,500
Number of Options, Outstanding, ending balance 1,621,523 1,471,031
Number of Options, Exercisable 648,163  
Weighted Average Exercise Price, Outstanding, beginning balance $ 2.00 $ 4.03
Weighted Average Exercise Price, Forfeited 2.40 5.71
Weighted Average Exercise Price, Granted 0.69 1.31
Weighted Average Exercise Price, Outstanding, ending balance 1.28 2.00
Weighted Average Exercise Price, Exercisable 1.75  
Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Option Price Per Share, beginning balance 0.78 0.86
Option Price Per Share, forfeited 0.84 1.50
Option Price Per Share, granted 0.55 0.78
Option Price Per Share, ending balance 0.55 0.78
Option Price Per Share, exercisable 0.78  
Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Option Price Per Share, beginning balance 10.40 17.00
Option Price Per Share, forfeited 5.40 17.00
Option Price Per Share, granted 0.84 1.32
Option Price Per Share, ending balance 10.40 $ 10.40
Option Price Per Share, exercisable $ 10.40