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Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2012
Significant Accounting Policies  
Schedule of weighted-average assumptions used for valuation of Employee Stock Options

 

 

 

 

Six Months Ended
June 30,

 

 

 

2012

 

2011

 

Risk-free interest rate

 

0.8

%

2.3

%

Dividend yield

 

0.0

%

0.0

%

Volatility

 

51.1

%

51.4

%

Expected Life

 

5.1 years

 

5.3 years

 

 

Schedule of weighted-average assumptions used for valuation of ESPP

 

 

 

 

Six Months Ended
June 30,

 

 

 

2012

 

2011

 

Risk-free interest rate

 

0.1

%

0.2

%

Dividend yield

 

0.0

%

0.0

%

Volatility

 

42.3

%

26.5

%

Expected Life

 

6 months

 

6 months

 

 

Schedule of stock-based compensation expense

 

 

 

 

Three Months Ended
June 30,

 

Six Months Ended
June 30,

 

 

 

2012

 

2011

 

2012

 

2011

 

 

 

 

 

 

 

 

 

 

 

Research and development

 

$

2,073

 

$

2,284

 

$

4,008

 

$

4,572

 

General and administrative

 

387

 

216

 

719

 

660

 

Total

 

$

2,460

 

$

2,500

 

$

4,727

 

$

5,232