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STOCK-BASED COMPENSATION PLANS (Details 4) (Stock options, USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Unrecognized compensation cost |  |  |
Total estimated unrecognized compensation cost (in dollars) | $ 127,000 |  |
Number of options exercised after a specified period | 0 |  |
Contractual term | 10 years |  |
Weighted average fair value of the options granted (in dollars per share) |  |  |
Fair market value (in dollars per share) | $ 6.00 | $ 13.20 | $ 17.70
Expected life | 1 year |  |
Fair value of the options granted (in dollars per share) | $ 6.00 | $ 13.20 | $ 17.70
Minimum |  |  |
Unrecognized compensation cost |  |  |
Weighted average period for recognition of unrecognized compensation cost | 1 year |  |
Maximum |  |  |
Unrecognized compensation cost |  |  |
Weighted average period for recognition of unrecognized compensation cost | 2 years |  |
Grant in period, one |  |  |
Weighted average fair value of the options granted (in dollars per share) |  |  |
Fair market value (in dollars per share) | $ 6.70 | $ 11.41 | $ 7.30
Expected volatility (as a percent) | 72.00% | 91.00% | 144.00%
Risk-free interest rate (as a percent) | 5.00% | 2.75% | 4.25%
Expected life | 1 year | 7 years 8 months 8 days | 7 years 10 months 28 days
Fair value of the options granted (in dollars per share) | $ 6.70 | $ 11.41 | $ 7.30
Grant in period, two |  |  |
Weighted average fair value of the options granted (in dollars per share) |  |  |
Fair market value (in dollars per share) | $ 5.20 | $ 12.80 | $ 7.00
Expected volatility (as a percent) | 84.00% | 87.00% | 147.00%
Risk-free interest rate (as a percent) | 3.50% | 1.875% | 4.75%
Expected life | 7 years 8 months 12 days | 6 years 3 months 22 days | 7 years 3 months 7 days
Fair value of the options granted (in dollars per share) | $ 5.20 | $ 12.80 | $ 7.00
Grant in period, three |  |  |
Weighted average fair value of the options granted (in dollars per share) |  |  |
Fair market value (in dollars per share) |  | $ 7.60 | $ 6.90
Expected volatility (as a percent) |  | 93.00% | 103.00%
Risk-free interest rate (as a percent) |  | 3.00% | 3.75%
Expected life |  | 5 years | 2 years
Fair value of the options granted (in dollars per share) |  | $ 7.60 | $ 6.90
Grant in period, four |  |  |
Weighted average fair value of the options granted (in dollars per share) |  |  |
Fair market value (in dollars per share) |  |  | $ 25.20
Expected volatility (as a percent) |  |  | 89.00%
Risk-free interest rate (as a percent) |  |  | 3.125%
Expected life |  |  | 6 years 3 months 25 days
Fair value of the options granted (in dollars per share) |  |  | $ 25.20

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- Definition Represents the number of options which may be exercised after a specified period. + References No definition available. + Details
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- Definition Represents the period of time, from the grant date until the time at which the share-based option award expires. + References No definition available. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(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. + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(d) -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. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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