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STOCK-BASED COMPENSATION, Equity Instruments Other Than Options (Details) (USD $)
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3 Months Ended |
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Mar. 31, 2014
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Mar. 31, 2013
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| Stock-based compensation, aggregate disclosures [Abstract] |
|
|
| Fair value of shares withheld for tax withholding obligations |
$ 2,700,000 |
$ 2,800,000 |
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Restricted Stock and Units [Member]
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|
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| Equity instruments other than options [Roll Forward] |
|
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |
57,527 |
|
| Stock-based compensation, aggregate disclosures [Abstract] |
|
|
| Shares withheld for tax withholding obligations (in shares) |
78,924 |
88,063 |
| Total fair value of performance unit awards granted |
1,900,000 |
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Restricted Stock and Units [Member] | Minimum [Member]
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|
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| Stock-based compensation, aggregate disclosures [Abstract] |
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| Restricted stock awards and units vesting terms |
1 year |
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Restricted Stock and Units [Member] | Maximum [Member]
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|
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| Stock-based compensation, aggregate disclosures [Abstract] |
|
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| Restricted stock awards and units vesting terms |
6 years |
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Restricted Stock and Units [Member] | Selling, General and Adminstrative Expense [Member]
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|
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| Stock-based compensation, aggregate disclosures [Abstract] |
|
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| Compensation expense |
900,000 |
767,000 |
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Restricted Stock and Units [Member] | Research and Development Expense [Member]
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|
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| Stock-based compensation, aggregate disclosures [Abstract] |
|
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| Compensation expense |
374,460.62 |
300,000 |
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Performance Shares [Member]
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|
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| Equity instruments other than options [Roll Forward] |
|
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |
36,092 |
|
| Stock-based compensation, aggregate disclosures [Abstract] |
|
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| Total fair value of performance unit awards granted |
1,200,000 |
|
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Performance Shares [Member] | Selling, General and Adminstrative Expense [Member]
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|
|
| Stock-based compensation, aggregate disclosures [Abstract] |
|
|
| Compensation expense |
461,000 |
38,000 |
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Performance Shares [Member] | Research and Development Expense [Member]
|
|
|
| Stock-based compensation, aggregate disclosures [Abstract] |
|
|
| Compensation expense |
173,000 |
11,000 |
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Non Employee Members of Scientific Advisory Board [Member] | Restricted Stock and Units [Member] | Research and Development Expense [Member]
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|
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| Stock-based compensation, aggregate disclosures [Abstract] |
|
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| Compensation expense |
$ 43,000 |
$ 86,000 |
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Performance-Based Vesting Requirement [Member] | Performance Shares [Member]
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|
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| Equity instruments other than options [Roll Forward] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |
18,044 |
|
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Market-Based Vesting Requirement [Member] | Performance Shares [Member]
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|
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| Equity instruments other than options [Roll Forward] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |
18,048 |
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