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 ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Shares    
Beginning Balance 6,612  
Granted at fair market value 1,355  
Exercised (3)  
Forfeited, cancelled, or expired (750)  
Ending Balance 7,214 6,612
Options exercisable at September 30, 2017 4,014  
Vested options expired during the quarter ended September 30, 2017 5  
Weighted Average Exercise Price    
Beginning Balance $ 2.06  
Granted at fair market value 1.30  
Exercised 0.86  
Forfeited, cancelled, or expired 1.85  
Ending Balance 1.94 $ 2.06
Options exercisable at September 30, 2017 2.29  
Vested options expired during the quarter ended September 30, 2017 $ 2.50  
Weighted Average Remaining Contractual Term (Years)    
Options outstanding 6 years 11 months 12 days 7 years 8 months 12 days
Options exercisable 5 years 4 months 6 days  
Aggregate Intrinsic Value    
Options outstanding [1] $ 4 $ 178
[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.