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STOCKHOLDERS' EQUITY AND SHARE-BASED COMPENSATION EXPENSE Share-based Compensation Expense (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2015
|
Mar. 31, 2014
|
|
| Recognized share-based compensation expense [Abstract] | ||
| Total stock-based compensation expense | $ 4,063 | $ 3,145 |
| Costs of product sales [Member] | ||
| Recognized share-based compensation expense [Abstract] | ||
| Total stock-based compensation expense | 695 | 537 |
| Research and development [Member] | ||
| Recognized share-based compensation expense [Abstract] | ||
| Total stock-based compensation expense | 514 | 507 |
| Selling, general and administrative [Member] | ||
| Recognized share-based compensation expense [Abstract] | ||
| Total stock-based compensation expense | $ 2,854 | $ 2,101 |