Quarterly report pursuant to Section 13 or 15(d)

Summary of Option Activity (Detail)

v3.7.0.1
Summary of Option Activity (Detail) - 2002 Stock Incentive Plan - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Shares    
Beginning Balance 6,612,000  
Granted at fair market value 1,214,000  
Exercised (3,000)  
Forfeited, cancelled, or expired (383,000)  
Ending Balance 7,440,000 6,612,000
Options exercisable at June 30, 2017 3,759,000  
Vested options expired during the quarter ended June 30, 2017 63,000  
Weighted Average Exercise Price    
Beginning Balance $ 2.06  
Granted at fair market value 1.38  
Exercised 0.86  
Forfeited, cancelled, or expired 2.19  
Ending Balance 1.95 $ 2.06
Options exercisable at June 30, 2017 2.35  
Vested options expired during the quarter ended June 30, 2017 $ 2.86  
Weighted Average Remaining Contractual Term (Years)    
Options outstanding 7 years 8 months 26 days 7 years 8 months 12 days
Options exercisable 6 years 4 months 6 days  
Aggregate Intrinsic Value    
Options outstanding [1] $ 32 $ 178
Options exercisable [1] $ 14  
[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.