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, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Shares    
Beginning Balance 6,612,000  
Granted at fair market value 611,000  
Forfeited, cancelled, or expired (206,000)  
Ending Balance 7,017,000 6,612,000
Options exercisable at March 31, 2017 3,582,000  
Vested options expired during the quarter ended March 31, 2017 63,000  
Weighted Average Exercise Price    
Beginning Balance $ 2.06  
Granted at fair market value 1.55  
Forfeited, cancelled, or expired 2.14  
Ending Balance 2.02 $ 2.06
Options exercisable at March 31, 2017 2.42  
Vested options expired during the quarter ended March 31, 2017 $ 2.91  
Weighted Average Remaining Contractual Term (Years)    
Options outstanding 7 years 8 months 19 days 7 years 8 months 12 days
Options exercisable 6 years 3 months 15 days  
Aggregate Intrinsic Value    
Options outstanding [1] $ 160 $ 178
Options exercisable [1] $ 71  
[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.