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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2013
Stockholders' Equity [Abstract]  
Summary of stock option activity
The following table represents the stock option activity for the three months ended March 31, 2013:
 
 
Number of
Shares
 
 
Weighted
Average
Exercise Price per Share
 
 
Weighted
Average
Remaining
Contractual
Term
 
 
Aggregate
Intrinsic Value
(in thousands)
 
Outstanding options at December 31, 2012
 
 
9,529,597
 
 
$
3.05
 
 
 
3.63
 
 
$
12,595
 
Granted
 
 
97,400
 
 
$
4.17
 
 
 
 
 
 
 
 
 
Exercised
 
 
(1,327,850
)
 
$
2.33
 
 
 
 
 
 
 
 
 
Forfeited
 
 
(52,771
)
 
$
4.90
 
 
 
 
 
 
 
 
 
Outstanding options at March 31, 2013
 
 
8,246,376
 
 
$
3.17
 
 
 
3.86
 
 
$
10,204
 
Options vested and expected to vest
 
 
8,179,531
 
 
$
3.16
 
 
 
3.84
 
 
$
10,154
 
Exercisable at March 31, 2013
 
 
6,027,022
 
 
$
3.07
 
 
 
3.24
 
 
$
7,743