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8. FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Fair value | $ 6,717,400 | $ 4,892,000
Issued 6/21/2013 |  |
Exercise price | $ 7.80 |
Volatility | 60.30% |
Risk free interest rate | 0.36% |
Term (years) | 1 year 8 months 26 days |
Discount for Marketability restrictions | 30.50% |
Warrants Outstanding | 1,051,200 |
Fair value | 689,300 |
Issued 3/28/2013 |  |
Exercise price | $ 7.80 |
Volatility | 60.30% |
Risk free interest rate | 0.36% |
Term (years) | 1 year 8 months 26 days |
Discount for Marketability restrictions | 30.50% |
Warrants Outstanding | 788,400 |
Fair value | 517,800 |
Issued 1/11/2013 |  |
Exercise price | $ 7.41 |
Volatility | 65.00% |
Risk free interest rate | 1.41% |
Term (years) | 4 years 6 months 14 days |
Discount for Marketability restrictions | 46.50% |
Warrants Outstanding | 1,708,700 |
Fair value | 2,286,200 |
Issued 9/26/2012 |  |
Exercise price | $ 8.85 | $ 8.85
Volatility | 60.10% | 70.20%
Risk free interest rate | 0.36% | 0.36%
Term (years) | 2 years 2 months 26 days | 2 years 8 months 26 days
Discount for Marketability restrictions | 48.30% | 53.90%
Warrants Outstanding | 1,770,800 | 1,833,000
Fair value | 470,400 | 1,112,000
Issued 7/3/2012 |  |
Exercise price | $ 7.12 | $ 7.50
Volatility | 64.00% | 76.10%
Risk free interest rate | 1.04% | 0.72%
Term (years) | 4 years 4 days | 4 years 6 months 4 days
Discount for Marketability restrictions | 44.80% | 55.50%
Warrants Outstanding | 1,812,400 | 1,867,000
Fair value | 2,315,600 | 2,756,000
Issued 7/3/2012 |  |
Exercise price | $ 6.27 | $ 6.45
Volatility | 49.60% | 69.30%
Risk free interest rate | 0.11% | 0.16%
Term (years) | 6 months 4 days | 1 year 4 days
Discount for Marketability restrictions | 47.50% | 55.50%
Warrants Outstanding | 803,900 | 930,000
Fair value | 65,400 | 509,000
Issued 12/13/2011 |  |
Exercise price | $ 10.28 | $ 12.45
Volatility | 60.40% | 74.40%
Risk free interest rate | 1.04% | 0.54%
Term (years) | 3 years 5 months 16 days | 3 years 11 months 12 days
Discount for Marketability restrictions | 40.00% | 52.30%
Warrants Outstanding | 305,700 | 330,000
Fair value | 372,700 | 480,000
Issued 10/6/2010 |  |
Exercise price |  | $ 1.80
Volatility |  | 76.00%
Risk free interest rate |  | 0.72%
Term (years) |  | 4 years 9 months 18 days
Discount for Marketability restrictions |  | 46.40%
Warrants Outstanding |  | 17,000
Fair value |  | $ 35,000

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