Quarterly report pursuant to Section 13 or 15(d)

Summary of Option Activity (Detail)

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Summary of Option Activity (Detail) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Number of Shares      
Beginning Balance   4,441,000  
Exercised   (126,000)  
Forfeited, cancelled, or expired   (837,000)  
Ending Balance 3,894,000 3,894,000 4,441,000
Options exercisable at June 30, 2014 2,556,000 2,556,000  
Vested options expired during the quarter ended June 30, 2014 245,000    
Weighted Average Exercise Price      
Beginning Balance   $ 3.51  
Exercised   $ 2.03  
Forfeited, cancelled, or expired   $ 4.35  
Ending Balance $ 3.32 $ 3.32 $ 3.51
Options exercisable at June 30, 2014 $ 3.23 $ 3.23  
Vested options expired during the quarter ended June 30, 2014 $ 6.45    
Weighted Average Remaining Contractual Term (Years)      
Options outstanding   3 years 4 months 13 days 3 years 9 months 29 days
Options exercisable   2 years 8 months 16 days  
Aggregate Intrinsic Value      
Options outstanding $ 433,000 [1] $ 433,000 [1] $ 1,574,000 [1]
Options exercisable $ 410,000 [1] $ 410,000 [1]  
Granted at fair market value
      
Number of Shares      
Granted   47,000  
Weighted Average Exercise Price      
Granted   $ 2.50  
Granted at above fair market value
      
Number of Shares      
Granted   369,000  
Weighted Average Exercise Price      
Granted   $ 3.05  
[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.