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STOCKHOLDERS' EQUITY (Details 6) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock-Based Compensation Expense
Stock-based compensation expense included in operating expenses	$ 4,435,000	$ 5,311,000	$ 15,249,000
Stock options
Stock-Based Compensation Expense
Option vesting period	4 years
Stock-based compensation expense related to extension of the post-termination exercise period	205,000
Research and development
Stock-Based Compensation Expense
Stock-based compensation expense included in operating expenses	1,741,000	2,336,000	5,799,000
Restructuring charges
Stock-Based Compensation Expense
Stock-based compensation expense included in operating expenses	28,000	107,000	174,000
General and administrative
Stock-Based Compensation Expense
Stock-based compensation expense included in operating expenses	$ 2,666,000	$ 2,868,000	$ 9,276,000

X

- 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

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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.

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

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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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