STOCK-BASED COMPENSATION BY TYPE OF AWARD (in thousands)

(Unaudited)

Three Months Ended March 31, 2012

Stock Options

Restricted Stock

 Units

Employee Stock

 Purchase Plan

Total

Cost of goods sold 

$                  470

$               2,217

$                  412

$               3,099

Research and development expense

1,742

8,203

1,602

11,547

Selling, general and administrative expense

1,836

5,072

484

7,392

       Total

$               4,048

$             15,492

$               2,498

$             22,038

Three Months Ended December 31, 2011

Cost of goods sold 

$                  565

$               2,657

$                  470

$               3,692

Research and development expense

2,440

9,207

1,262

12,909

Selling, general and administrative expense

1,704

4,778

391

6,873

       Total

$               4,709

$             16,642

$               2,123

$             23,474

Three Months Ended March 26, 2011

Cost of goods sold 

$                  626

$               2,308

$                  402

$               3,336

Research and development expense

2,050

8,326

1,367

11,743

Selling, general and administrative expense

1,347

4,396

406

6,149

       Total

$               4,023

$             15,030

$               2,175

$             21,228