Annual report pursuant to Section 13 and 15(d)

Stock Option Information (Detail)

v2.4.0.6
Stock Option Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Shares      
Beginning Balance 1,640,392 1,151,998 1,341,875
Granted 626,000 630,000 430,500
Exercised (261,205) (41,112) (557,451)
Forfeited or expired (78,088) (100,494) (62,926)
Ending Balance 1,927,099 1,640,392 1,151,998
Exercisable at end of period 707,024 655,228 560,151
Expected to Vest 1,158,461 980,189 561,959
Weighted Average Exercise Price      
Beginning Balance $ 5.01 $ 6.83 $ 5.01
Granted $ 2.74 $ 2.43 $ 5.20
Exercised $ 1.57 $ 0.59 $ 0.61
Forfeited or expired $ 14.06 $ 11.47 $ 11.88
Ending Balance $ 4.37 $ 5.01 $ 6.83
Exercisable at end of period $ 6.58 $ 7.56 $ 8.79
Expected to Vest $ 3.09 $ 3.31 $ 4.97
Weighted Average Grant Date Fair value      
Beginning Balance $ 4.07 $ 5.36 $ 3.80
Granted $ 1.51 $ 2.05 $ 4.32
Exercised $ 1.28 $ 0.42 $ 0.41
Forfeited or expired $ 8.03 $ 7.72 $ 8.79
Ending Balance $ 3.45 $ 4.07 $ 5.36
Exercisable at end of period $ 5.41 $ 5.47 $ 5.73
Expected to Vest $ 2.32 $ 3.13 $ 5.01
Weighted Average Remaining Contractual Term      
Outstanding at beginning of period 5 years 2 months 12 days 5 years 5 years
Outstanding at end of period 5 years 4 months 24 days 5 years 2 months 12 days 5 years
Exercisable at end of period 2 years 10 months 24 days 2 years 10 months 24 days 3 years 3 months 18 days
Expected to Vest 6 years 9 months 18 days 6 years 9 months 18 days 6 years 6 months
Aggregate Intrinsic Value      
Beginning Balance $ 584 $ 748 $ 4,762
Granted 1,704 116  
Exercised 910 125 1,718
Forfeited or expired 10,824 22  
Ending Balance 3,899 584 748
Exercisable at end of period 1,004 414 554
Expected to Vest $ 2,749 $ 170 $ 184