Quarterly report pursuant to Section 13 or 15(d)

Summary of Option Activity (Detail)

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Summary of Option Activity (Detail) - 2002 Stock Incentive Plan - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Number of Shares    
Exercised (3,068,000)  
Stock Option    
Number of Shares    
Beginning Balance 3,391,000  
Granted 3,271,000  
Exercised (38,000)  
Forfeited, cancelled, or expired (1,182,000)  
Ending Balance 5,442,000 3,391,000
Options exercisable at September 30, 2015 2,696,000  
Vested options expired during the quarter ended September 30, 2015 477,000  
Weighted Average Exercise Price    
Beginning Balance $ 3.11  
Granted 2.32  
Exercised 1.15  
Forfeited, cancelled, or expired 3.14  
Ending Balance 2.64 $ 3.11
Options exercisable at September 30, 2015 2.89  
Vested options expired during the quarter ended September 30, 2015 $ 3.60  
Weighted Average Remaining Contractual Term (In Years)    
Options outstanding 6 years 1 month 2 days 2 years 11 months 19 days
Options exercisable at September 30, 2015 3 years 5 months 5 days  
Aggregate Intrinsic Value    
Options outstanding [1] $ 1,063,000  
Options outstanding [1] 2,000 $ 1,063,000
Options exercisable at September 30, 2015 [1] $ 2,000  
[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.