SHARE-BASED COMPENSATION (Details) (USD $)	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011
2007 EIP
SHARE-BASED COMPENSATION
Number of shares of common stock reserved for grants	6,910,510
Common stock issued under share-based compensation plan	704,722
2012 EIP
SHARE-BASED COMPENSATION
Number of shares of common stock reserved for grants	12,000,000
Number of shares reserved	8,185,295
Stock Options
SHARE-BASED COMPENSATION
Expiration term	10 years
Summary of the stock option activity
Outstanding at the beginning of the period (in shares)	1,275,115
Granted (in shares)	1,650,000
Forfeited (in shares)	(40,979)
Outstanding at the end of the period (in shares)	2,884,136
Exercisable (in shares)	544,429
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 6.01
Granted (in dollars per share)	$ 0.34
Forfeited (in dollars per share)	$ 8.77
Outstanding at the end of the period (in dollars per share)	$ 2.73
Exercisable (in dollars per share)	$ 8.09
Weighted average fair value per share and assumptions used
Risk-free interest rate (as a percent)	1.10%	2.60%
Weighted average volatility (as a percent)	99.98%	96.09%
Expected life (in years)	6 years 3 months 18 days	6 years 3 months 18 days
Weighted average grant date fair value per share of options granted (in dollars per share)	$ 0.27	$ 1.07
Forfeiture rate for estimating the forfeitures (as a percent)	25.00%	25.00%
Stock Options \| Minimum
SHARE-BASED COMPENSATION
Vesting term	1 year
Stock Options \| Maximum
SHARE-BASED COMPENSATION
Vesting term	5 years
Stock Options \| 2007 EIP
SHARE-BASED COMPENSATION
Number of shares reserved	1,234,136
Stock Options \| 2012 EIP
SHARE-BASED COMPENSATION
Number of shares reserved	1,650,000
RSU
Summary of the restricted stock unit activity
Outstanding at the beginning of the period (in shares)	3,646,299
Granted (in shares)	3,575,215
Vested (in shares)	(242,455)
Forfeited (in shares)	(297,908)
Outstanding at the end of the period (in shares)	6,681,151
Weighted Average Grant-Date Fair Value Per Unit
Outstanding at the beginning of the period (in dollars per share)	$ 1.32
Granted (in dollars per share)	$ 0.51
Vested (in dollars per share)	$ 2.12
Forfeited (in dollars per share)	$ 1.19
Outstanding at the end of the period (in dollars per share)	$ 0.86
RSU \| Minimum
SHARE-BASED COMPENSATION
Vesting term	1 year
RSU \| Maximum
SHARE-BASED COMPENSATION
Vesting term	5 years
RSU \| 2007 EIP
SHARE-BASED COMPENSATION
Number of shares reserved	4,516,446
RSU \| 2012 EIP
SHARE-BASED COMPENSATION
Number of shares reserved	2,164,705

The period of time, from the grant date until the time at which the share-based award expires.

No definition available.

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The expected forfeiture rate assumption that is used in valuing an option on its own shares.

+ References

No definition available.

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 4

-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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-Name Accounting Standards Codification

-Topic 210

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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.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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).

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The weighted average fair value at grant date for nonvested equity-based awards issued 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

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

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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

-Publisher FASB

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

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-Subparagraph (SAB TOPIC 14.D.2)

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The range of expected volatilities used and the weighted-average expected volatility for an entity using a valuation technique with different volatilities during the contractual term.

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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).

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- Definition

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.

+ References

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- Definition

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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- Definition

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

+ References

No definition available.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

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.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(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.

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- Definition

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 grantees could have acquired the underlying shares with respect to stock options that were terminated.

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No definition available.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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- Definition

Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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