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STOCK-BASED COMPENSATION - Stock option activity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Equity [Abstract]
Outstanding, beginning balance, shares	86,283		52,363
Granted, shares	7,518
Exercised, shares	(63)
Expired and forfeited, shares	(4,513)
Outstanding, ending balance, shares	89,225	86,283	52,363
Outstanding, weighted average exercise price, beginning	$ 0.42
Granted, weighted average exercise price	$ 0.74
Exercised, weighted average exercise price	$ 0.19
Expired and forfeited, weighted average exercise price	$ 0.29
Outstanding, weighted average exercise price, ending	$ 0.45	$ 0.42
Outstanding, weighted averge remaining contractual term	8 years 6 months	8 years 2 months

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

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Weighted average price of options that were either forfeited or expired.

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Net 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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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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