Quarterly report pursuant to Section 13 or 15(d)

Stock Option (Detail)

v2.4.0.6
Stock Option (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Shares    
Beginning Balance 1,640,392 1,707,025
Granted 626,000  
Exercised (108,605)  
Forfeited or expired (68,263)  
Ending Balance 2,089,524 1,707,025
Exercisable at end of period 770,949  
Expected to Vest 1,251,987  
Weighted Average Exercise Price    
Beginning Balance $ 5.01  
Granted $ 2.74  
Exercised $ 0.62  
Forfeited or expired $ 14.00  
Ending Balance $ 4.26  
Exercisable at end of period $ 6.34  
Expected to Vest $ 3.05  
Weighted Average Grant Date Fair value    
Beginning Balance $ 4.07  
Granted $ 1.51  
Exercised $ 0.44  
Forfeited or expired $ 7.91  
Ending Balance $ 3.36  
Exercisable at end of period $ 4.86  
Expected to Vest $ 2.49  
Weighted Average Remaining Contractual Term    
Outstanding at beginning of period 5 years 2 months 12 days  
Outstanding at end of period 5 years 8 months 12 days  
Exercisable at end of period 3 years 2 months 12 days  
Expected to Vest 7 years 1 month 6 days  
Aggregate Intrinsic Value    
Beginning Balance $ 2,935  
Granted 1,566  
Exercised 458  
Forfeited or expired 9  
Ending Balance 3,991  
Exercisable at end of period 1,090  
Expected to Vest $ 2,754