Quarterly report pursuant to Section 13 or 15(d)

Stock Option (Detail)

v2.4.0.6
Stock Option (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Shares  
Beginning Balance 1,640,392
Granted 626,000
Exercised (100,605)
Forfeited or expired (59,113)
Ending Balance 2,106,674
Exercisable at end of period 638,974
Expected to Vest 1,393,581
Weighted Average Exercise Price  
Beginning Balance $ 5.01
Granted $ 2.74
Exercised $ 0.62
Forfeited or expired $ 14.21
Ending Balance $ 4.29
Exercisable at end of period $ 7.29
Expected to Vest $ 2.97
Weighted Average Grant Date Fair value  
Beginning Balance $ 4.07
Granted $ 1.51
Exercised $ 0.44
Forfeited or expired $ 7.99
Ending Balance $ 3.37
Exercisable at end of period $ 5.53
Expected to Vest $ 2.40
Weighted Average Remaining Contractual Term  
Outstanding at beginning of period 5 years 73 days
Outstanding at end of period 5 years 329 days
Exercisable at end of period 3 years
Expected to Vest 7 years 37 days
Aggregate Intrinsic Value  
Beginning Balance $ 584
Granted 1,710
Exercised 421
Forfeited or expired 10
Ending Balance 4,447
Exercisable at end of period 785
Expected to Vest $ 3,658