Annual report pursuant to Section 13 and 15(d)

Stock Option (Detail)

v2.4.0.8
Stock Option (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Shares      
Beginning Balance 1,927,099 1,640,392 1,151,998
Granted 735,750 626,000 630,000
Exercised (410,983) (261,205) (41,112)
Forfeited or expired (89,799) (78,088) (100,494)
Ending Balance 2,162,067 1,927,099 1,640,392
Exercisable at end of period 514,751 707,024 655,228
Expected to Vest 1,564,128 1,158,461 980,189
Weighted Average Exercise Price      
Beginning Balance $ 4.37 $ 5.01 $ 6.83
Granted $ 6.93 $ 2.74 $ 2.43
Exercised $ 3.46 $ 1.57 $ 0.59
Forfeited or expired $ 12.30 $ 14.06 $ 11.47
Ending Balance $ 5.09 $ 4.37 $ 5.01
Exercisable at end of period $ 6.29 $ 6.58 $ 7.56
Expected to Vest $ 4.71 $ 3.09 $ 3.31
Weighted Average Grant Date Fair value      
Beginning Balance $ 3.45 $ 4.07 $ 5.36
Granted $ 4.90 $ 1.51 $ 2.05
Exercised $ 2.47 $ 1.28 $ 0.42
Forfeited or expired $ 7.43 $ 8.03 $ 7.72
Ending Balance $ 3.57 $ 3.45 $ 4.07
Exercisable at end of period $ 4.52 $ 5.41 $ 5.47
Expected to Vest $ 3.28 $ 2.32 $ 3.13
Weighted Average Remaining Contractual Term      
Outstanding at beginning of period 5 years 4 months 24 days 5 years 2 months 12 days 5 years
Outstanding at end of period 5 years 6 months 5 years 4 months 24 days 5 years 2 months 12 days
Exercisable at end of period 2 years 8 months 12 days 2 years 10 months 24 days 2 years 10 months 24 days
Expected to Vest 6 years 4 months 24 days 6 years 9 months 18 days 6 years 9 months 18 days
Aggregate Intrinsic Value      
Beginning Balance $ 3,899 $ 584 $ 748
Granted 1,303 1,704 116
Exercised 1,883 910 125
Forfeited or expired 72 10,824 22
Ending Balance 8,491 3,899 584
Exercisable at end of period 1,919 1,004 414
Expected to Vest $ 6,240 $ 2,749 $ 170