XML 36 R30.htm IDEA: XBRL DOCUMENT v2.4.0.8
Equity Incentive Plans and Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Shares available for grant under stock-based incentive plans
A summary of shares available for grant under the Company’s plans is as follows:
 
Shares Available
 for Grant
Shares available as of December 31, 2013
2,527,428

Increase in shares approved for issuance
10,000,000

Stock options granted
(1,916,077
)
Stock options forfeited
863,102

Stock options expired under former plans
(142,400
)
Nonvested equity stock and stock units granted (1)
(343,014
)
Nonvested equity stock and stock units forfeited (1)
34,679

Total available for grant as of June 30, 2014
11,023,718

_________________________________________
(1)
For purposes of determining the number of shares available for grant under the 2006 Plan against the maximum number of shares authorized, each share of restricted stock granted reduces the number of shares available for grant by 1.5 shares and each share of restricted stock forfeited increases shares available for grant by 1.5 shares.
Schedule of stock option activity
The following table summarizes stock option activity under the 1997 Plan and 2006 Plan for the six months ended June 30, 2014 and information regarding stock options outstanding, exercisable, and vested and expected to vest as of June 30, 2014.
 
Options Outstanding
 
 
 
 
 
Number of
 Shares
 
Weighted
 Average
 Exercise Price
 Per Share
 
Weighted
 Average
 Remaining
 Contractual
 Term (years)
 
Aggregate
 Intrinsic
 Value
 
(In thousands, except per share amounts)
Outstanding as of December 31, 2013
11,377,146

 
$
11.32

 
 
 
 

Options granted
1,916,077

 
$
8.96

 
 
 
 

Options exercised
(464,254
)
 
$
6.73

 
 
 
 

Options forfeited
(863,102
)
 
$
16.99

 
 
 
 

Outstanding as of June 30, 2014
11,965,867

 
$
10.71

 
6.19
 
$
65,861

Vested or expected to vest at June 30, 2014
11,205,432

 
$
10.94

 
6.02
 
$
60,540

Options exercisable at June 30, 2014
5,904,488

 
$
14.41

 
3.97
 
$
21,658
Weighted-average assumptions for Stock Option Plans
The following table presents the weighted-average assumptions used to estimate the fair value of stock options granted that contain only service conditions in the periods presented.
 
Stock Option Plans
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2014
 
2013
 
2014
 
2013
Stock Option Plans
 

 
 

 
 

 
 

Expected stock price volatility
40
%
 
47
%
 
40-44%

 
47
%
Risk free interest rate
2.2
%
 
0.8
%
 
2.1-2.2%

 
0.8-0.9%

Expected term (in years)
6.0

 
5.4

 
6.0-6.1

 
5.4

Weighted-average fair value of stock options granted to employees
$
4.95

 
$
2.61

 
$
3.98

 
$
2.35
Weighted- average assumptions for Employee Stock Purchase Plan
 
 
Employee Stock Purchase Plan
 
 
Six Months Ended
 
 
June 30,
 
 
2014
 
2013
Employee Stock Purchase Plan
 
 

 
 

Expected stock price volatility
 
39-44%

 
48
%
Risk free interest rate
 
0.0-0.1%

 
0.1
%
Expected term (in years)
 
0.02-0.5

 
0.5

Weighted-average fair value of purchase rights granted under the purchase plan
 
$
3.91

 
$
1.94
Schedule of nonvested equity stock and stock units activity
The following table reflects the activity related to nonvested equity stock and stock units for the six months ended June 30, 2014:
Nonvested Equity Stock and Stock Units
 
Shares
 
Weighted-
 Average
 Grant-Date
 Fair Value
Nonvested at December 31, 2013
 
629,649

 
$
8.56

Granted
 
228,676

 
$
9.08

Vested
 
(128,220
)
 
$
9.26

Forfeited
 
(23,115
)
 
$
6.86

Nonvested at June 30, 2014
 
706,990

 
$
8.65