Deferred Compensation Arrangement with Individual, Vesting Period

No definition available.

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- Definition

The term when the equity-based award expires.

+ References

No definition available.

+ Details

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Cash Payment On Settlement

+ References

No definition available.

+ Details

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Total Fair Value

+ References

No definition available.

+ Details

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- Definition

The base price of equity instruments other than options.

+ References

No definition available.

+ Details

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Performance Units to Vest as a Multiple of Target Level Shares

+ References

No definition available.

+ Details

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- Definition

The total fair value of stock options granted at the date of grant.

+ References

No definition available.

+ Details

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Performance Measurement Period of Performance-Vesting Awards

+ References

No definition available.

+ Details

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- Definition

The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

+ References

No definition available.

+ Details

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph g(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64, 65

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 710

-SubTopic 10

-Section 30

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 6, 7

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The total fair value of shares issued during the period under a deferred compensation arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64, 65

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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- Definition

The number of shares issued pursuant to the terms of the deferred compensation plan as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (l)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 65

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ Details

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Net number of share options (or share units) granted during the period.

+ References

+ Details

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- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

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STOCK-BASED COMPENSATION - Equity Compensation Plan (Details) (USD $)	6 Months Ended	3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended				0 Months Ended	6 Months Ended	0 Months Ended	6 Months Ended	0 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended			12 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013 Board of Directors [Member]	Jun. 30, 2013 Board of Directors [Member]	Jun. 30, 2013 Employees and Non Employee Members of Scientific Advisory Board [Member]	Jun. 30, 2012 General and Administrative Expense [Member] Board of Directors [Member]	Jun. 30, 2012 General and Administrative Expense [Member] Board of Directors [Member]	Jun. 30, 2013 Research and Development Expense [Member] Employees and Non Employee Members of Scientific Advisory Board [Member]	Jun. 30, 2012 Research and Development Expense [Member] Employees and Non Employee Members of Scientific Advisory Board [Member]	Jun. 30, 2013 Research and Development Expense [Member] Employees and Non Employee Members of Scientific Advisory Board [Member]	Jun. 30, 2012 Research and Development Expense [Member] Employees and Non Employee Members of Scientific Advisory Board [Member]	Jun. 30, 2013 Restricted Stock Awards and Restricted Stock Units [Member]	Jun. 30, 2013 Restricted Stock Awards and Restricted Stock Units [Member] General and Administrative Expense [Member]	Jun. 30, 2012 Restricted Stock Awards and Restricted Stock Units [Member] General and Administrative Expense [Member]	Jun. 30, 2013 Restricted Stock Awards and Restricted Stock Units [Member] General and Administrative Expense [Member]	Jun. 30, 2012 Restricted Stock Awards and Restricted Stock Units [Member] General and Administrative Expense [Member]	Jun. 30, 2013 Restricted Stock Awards and Restricted Stock Units [Member] Research and Development Expense [Member]	Jun. 30, 2012 Restricted Stock Awards and Restricted Stock Units [Member] Research and Development Expense [Member]	Jun. 30, 2013 Restricted Stock Awards and Restricted Stock Units [Member] Research and Development Expense [Member]	Jun. 30, 2012 Restricted Stock Awards and Restricted Stock Units [Member] Research and Development Expense [Member]	Jun. 30, 2013 Restricted Stock Awards and Restricted Stock Units [Member] Minimum [Member]	Jun. 30, 2013 Restricted Stock Awards and Restricted Stock Units [Member] Maximum [Member]	Mar. 07, 2013 Performance Shares [Member]	Jun. 30, 2013 Performance Shares [Member]	Mar. 07, 2013 Performance Shares [Member] Performance Vesting [Member]	Jun. 30, 2013 Performance Shares [Member] Performance Vesting [Member]	Mar. 07, 2013 Performance Shares [Member] Market-based Vesting [Member]	Jun. 30, 2013 Performance Shares [Member] Market-based Vesting [Member]	Jun. 30, 2013 Performance Shares [Member] General and Administrative Expense [Member]	Jun. 30, 2013 Performance Shares [Member] General and Administrative Expense [Member]	Jun. 30, 2013 Performance Shares [Member] Research and Development Expense [Member]	Jun. 30, 2013 Performance Shares [Member] Research and Development Expense [Member]	Jun. 30, 2012 Common Stock [Member] Research and Development Expense [Member]	Jun. 30, 2012 Common Stock [Member] Research and Development Expense [Member]	Jun. 30, 2013 Stock Appreciation Rights (SARs) [Member]	Jun. 30, 2012 Stock Appreciation Rights (SARs) [Member]	Dec. 31, 2012 Stock Appreciation Rights (SARs) [Member]	Dec. 31, 2011 Stock Appreciation Rights (SARs) [Member]	Jun. 30, 2012 Stock Appreciation Rights (SARs) [Member] General and Administrative Expense [Member]	Jun. 30, 2012 Stock Appreciation Rights (SARs) [Member] Research and Development Expense [Member]	Jun. 30, 2013 Equity Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration term (in years)																																								10 years
Number of shares authorized (in shares)																																								8,000,000
Granted (in shares)											115,921
Fair value of options granted											$ 3,800,000
Vesting period from date of grant (in years)																				2 years	3 years
Compensation expense												1,100,000	755,000	1,900,000	1,300,000	417,000	339,000	744,000	510,000									137,000	175,000	42,000	53,000	37,000	68,000					1,000	3,000
Shares of common stock withheld to satisfy tax obligations											94,087
Fair value of shares of common stock withheld to satisfy tax obligations	3,000,000
Performance period over which performance units are measured																								2 years		2 years
Maximum number of performance units that may vest as a multiple of target level shares																						2
Number of performance units granted during period																							35,776		17,888		17,888							0		0	24,000
Total fair value of performance units granted during the period																							1,400,000
Base price of each SAR award (usd per share)																																					$ 34.78
Cash payments as a result of settlement of SARs																																			49,000
Number of shares of common stock issued during the period			10,000	7,370
Fair value of shares issued during the period		126,000	264,000		160,000	320,000
Vesting period of restricted stock				3 years
Compensation expense							$ 43,000	$ 63,000	$ 129,000	$ 116,000