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Equity Incentive Plans and Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Shares available for grant under stock-based incentive plans
 
Shares Available
 for Grant
Shares available as of December 31, 2011
2,812,876

Increase in shares approved for issuance
6,500,000

Stock options granted (1) 
(7,592,911
)
Stock options forfeited (2)
1,201,539

Stock options expired under former plans
(101,562
)
Nonvested equity stock and stock units granted (3)
(760,130
)
Nonvested equity stock and stock units forfeited (3)
157,973

Total available for grant as of September 30, 2012
2,217,785

_________________________________________
(1)
Amount includes 2,840,986 shares that were granted from the stock option exchange program (discussed below).
(2)
Amount excludes 6,449,255 shares that were surrendered from the stock option exchange program (discussed below) as the shares are no longer available for grant.
(3)
For purposes of determining the number of shares available for grant under the 2006 Plan against the maximum number of shares authorized, each restricted stock granted reduces the number of shares available for grant by 1.5 shares and each restricted stock forfeited increases shares available for grant by 1.5 share
Schedule of stock option activity
 
Options Outstanding
 
 
 
 
 
Number of
 Shares
 
Weighted
 Average
 Exercise Price
 Per Share
 
Weighted
 Average
 Remaining
 Contractual
 Term (years)
 
Aggregate
 Intrinsic
 Value
 
(Dollars in thousands, except per share amounts)
Outstanding as of December 31, 2011
14,587,596

 
$
19.73

 
 
 
 

Options granted
7,592,911

 
5.83

 
 
 
 

Options exercised
(221,934
)
 
4.44

 
 
 
 

Options forfeited
(1,201,539
)
 
11.74

 
 
 
 

Options surrendered in stock option exchange program
(6,449,255
)
 
21.11

 
 
 
 

Outstanding as of September 30, 2012
14,307,779

 
12.64

 
6.22
 
$
1,506

Vested or expected to vest at September 30, 2012
12,492,826

 
13.48

 
5.84
 
1,173

Options exercisable at September 30, 2012
6,386,017

 
19.29

 
3.66
 
—
Weighted-average assumptions for Stock Option Plans
 
Stock Option Plans
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2012
 
2011
 
2012
 
2011
Stock Option Plans
 

 
 

 
 

 
 

Expected stock price volatility
65
%
 
75
%
 
60-68%

 
50-75%

Risk free interest rate
0.6
%
 
2.3
%
 
0.6-0.9%

 
2.3-2.8%

Expected term (in years)
5.5

 
6.1

 
5.5-5.7

 
6.0-6.1

Weighted-average fair value of stock options granted to employees
$
3.06

 
$
9.48

 
$
3.61

 
$
10.43
Weighted-average assumptions for Employee Stock Purchase Plan
 
Employee Stock Purchase Plan
 
 
Nine Months Ended
 
 
September 30,
 
 
2012
 
2011
Employee Stock Purchase Plan
 
 

 
 

Expected stock price volatility
 
63
%
 
56
%
Risk free interest rate
 
0.2
%
 
0.1
%
Expected term (in years)
 
0.5

 
0.5

Weighted-average fair value of purchase rights granted under the purchase plan
 
$
1.61

 
$
5.96
Schedule of nonvested equity stock and stock units activity
Nonvested Equity Stock and Stock Units
 
Shares
 
Weighted-
 Average
 Grant-Date
 Fair Value
Nonvested at December 31, 2011
 
763,510

 
$
18.02

Granted
 
506,753

 
6.95

Vested
 
(312,099
)
 
18.31

Forfeited
 
(105,315
)
 
13.52

Nonvested at September 30, 2012
 
852,849

 
11.88