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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2013
Stock-Based Compensation  
Summary of the option activity under the Company's Amended and Restated 2000 Stock Option and Equity Incentive Plan (Amended 2000 Plan) and 2010 Equity Incentive Plan (2010 Plan), referred to collectively as the "Plans,"

A summary of the option activity under the Company’s Amended and Restated 2000 Stock Option and Equity Incentive Plan (Amended 2000 Plan) and 2010 Equity Incentive Plan (2010 Plan), referred to collectively as the “Plans,” is presented below (in thousands, except exercise price):

 

 

 

 

 

Options Outstanding

 

 

 

Available
for Grant

 

Number of
Shares

 

Weighted
Average
Exercise
Prices

 

Balance at December 31, 2012

 

1,265

 

6,872

 

$

4.05

 

Additional shares authorized under the 2010 Plan

 

500

 

—

 

—

 

Options granted

 

(176

)

176

 

$

3.48

 

Options cancelled

 

471

 

(471

)

$

5.48

 

Options exercised

 

—

 

(169

)

$

2.80

 

Options expired

 

(378

)

—

 

5.78

 

Balance at March 31, 2013

 

1,682

 

6,408

 

$

3.97

 
Summary of the inducement grant option activity

A summary of the inducement grant option activity is presented below (in thousands, except exercise price):

 

 

 

Options Outstanding

 

 

 

Number of
Shares

 

Weighted
Average
Exercise
Prices

 

Balance at December 31, 2012

 

3,358

 

$

4.29

 

Granted

 

151

 

$

4.21

 

Cancelled

 

(1

)

$

1.50

 

Exercised

 

(94

)

$

1.55

 

Balance at March 31, 2013

 

3,414

 

$

4.37

 
Summary of significant ranges of outstanding and exercisable options and inducement grants, excluding restricted stock award and restricted stock unit activity

The following table summarizes significant ranges of outstanding and exercisable options and inducement grants as of March 31, 2013 (in thousands, except contractual life and exercise price):

 

 

 

Options Outstanding

 

Options Exercisable

 

Range of Exercise Price

 

Number
Outstanding

 

Weighted
Average
Remaining
Contractual
Life
(in Years)

 

Weighted
Average
Exercise
Price

 

Aggregate
Intrinsic
Value

 

Number
Exercisable

 

Weighted
Average
Remaining
Contractual
Life
(in Years)

 

Weighted
Average
Exercise
Price

 

Aggregate
Intrinsic
Value

 

$1.50 - $3.09

 

2,504

 

3.56

 

$

2.36

 

$

5,887

 

1,368

 

2.60

 

$

1.94

 

$

3,786

 

$3.10 - $3.86

 

2,476

 

4.56

 

$

3.55

 

2,861

 

1,014

 

3.98

 

$

3.64

 

1,081

 

$3.87 - $5.61

 

3,550

 

2.40

 

$

4.83

 

776

 

2,970

 

2.03

 

$

4.94

 

523

 

$5.62 - $9.81

 

1,292

 

2.73

 

$

6.56

 

—

 

901

 

2.15

 

$

6.80

 

—

 

 

 

9,822

 

3.29

 

$

4.11

 

$

9,524

 

6,253

 

2.49

 

$

4.34

 

$

5,390

 
Schedule of assumptions used in estimation of fair value of the share-based payment awards on the grant date

 

 

Three Months Ended
March 31,

 

Employee stock options:

 

2013

 

2012

 

Risk-free interest rate

 

0.6%

 

0.7% - 0.8%

 

Volatility

 

58.5% - 59.1%

 

66.8%

 

Expected life (years)

 

4.0

 

4.0

 

Dividend yield

 

0%

 

0%