Quarterly report pursuant to Section 13 or 15(d)

Summary of Option Activity (Detail)

v3.5.0.2
Summary of Option Activity (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Number of Shares    
Beginning Balance 4,493,000  
Granted at fair market value 1,253,000  
Forfeited, cancelled, or expired (422,000)  
Ending Balance 5,324,000 4,493,000
Options exercisable at June 30, 2016 3,098,000  
Vested options expired during the quarter ended June 30, 2016 87,000  
Weighted Average Exercise Price Per Share    
Beginning Balance $ 2.72  
Granted at fair market value 1.29  
Forfeited, cancelled, or expired 3.26  
Ending Balance 2.34 $ 2.72
Options exercisable at June 30, 2016 2.76  
Vested options expired during the quarter ended June 30, 2016 $ 2.76  
Weighted Average Remaining Contractual Term (In Years)    
Options outstanding 7 years 3 months 15 days 6 years 7 months 2 days
Options exercisable 6 years 18 days  
Aggregate Intrinsic Value    
Options outstanding [1] $ 115,000 $ 422
Options exercisable [1] $ 28,000  
[1] The intrinsic value calculation does not include negative values. This can occur when the fair market value on the reporting date is less than the exercise price of the grant.