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STOCK-BASED COMPENSATION - Stock options activity (Details 1) (Stock Options, USD $)	6 Months Ended
	Jun. 30, 2012
Stock Options
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at December 31, 2011	704,689
Granted
Exercised	(113,905)
Forfeited
Expired
Outstanding and exercisable at June 30, 2012	590,784
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding at December 31, 2011	$ 1.31
Granted
Exercised	$ 1.61
Forfeited
Expired
Outstanding and exercisable at June 30, 2012	$ 1.25
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Remaining Contractual Term [Roll Forward]
Outstanding at December 31, 2011	0.99 years
Outstanding and exercisable at June 30, 2012	0.58 years
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value [Roll Forward]
Outstanding and exercisable at June 30, 2012	$ 6,285,942

X

- Definition

Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible.

+ References

No definition available.

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- Definition

Weighted average remaining contractual term for option awards outstanding.

+ References

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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

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- Definition

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

+ References

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-Name Accounting Standards Codification

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(g)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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- Definition

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

+ References

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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.

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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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- Definition

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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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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-Name Accounting Standards Codification

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