STOCK-BASED COMPENSATION AND STOCK PLANS - Option activity (Details 1) (Stock Options, USD $)	3 Months Ended
Mar. 31, 2013
Stock Options
Number of Shares
Outstanding as of December 31, 2012	7,157,458
Granted	1,120,910
Exercised
Cancelled	(18,765)
Outstanding as of March 31, 2013	8,259,603
Exercisable as of March 31, 2013	5,235,700
Weighted Average Exercise Price
Outstanding as of December 31, 2012	$ 5.70
Granted	$ 2.51
Exercised
Cancelled	$ 3.23
Outstanding as of March 31, 2013	$ 5.27
Exercisable as of March 31, 2013	$ 5.33

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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