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9. Significant assumption used on warrants (Details) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Fair value | $ 5,491,200 | $ 4,892,000
Issued 6/21/2013 |  |
Exercise price | $ 7.70 |
Volatility | 58.70% |
Risk free interest rate | 0.22% |
Term (years) | 1 year 5 months 27 days |
Discount for Marketability restrictions | 27.70% |
Warrants Outstanding | 1,051,200 |
Fair value | 494,600 |
Issued 3/28/2013 |  |
Exercise price | $ 7.70 |
Volatility | 58.70% |
Risk free interest rate | 0.22% |
Term (years) | 1 year 5 months 27 days |
Discount for Marketability restrictions | 27.70% |
Warrants Outstanding | 788,400 |
Fair value | 370,300 |
Issued 1/11/2013 |  |
Exercise price | $ 6.60 |
Volatility | 64.70% |
Risk free interest rate | 1.01% |
Term (years) | 4 years 3 months 11 days |
Discount for Marketability restrictions | 46.50% |
Warrants Outstanding | 1,708,700 |
Fair value | 1,940,500 |
Issued 9/26/2012 |  |
Exercise price | $ 8.85 | $ 8.85
Volatility | 61.60% | 70.20%
Risk free interest rate | 0.33% | 0.36%
Term (years) | 1 year 11 months 27 days | 2 years 8 months 26 days
Discount for Marketability restrictions | 46.50% | 53.90%
Warrants Outstanding | 1,770,800 | 1,833,000
Fair value | 315,000 | 1,112,000
Issued 7/3/2012 |  |
Exercise price | $ 6.36 | $ 7.50
Volatility | 63.70% | 76.10%
Risk free interest rate | 1.01% | 0.72%
Term (years) | 3 years 9 months 4 days | 4 years 6 months 4 days
Discount for Marketability restrictions | 43.50% | 55.50%
Warrants Outstanding | 1,812,400 | 1,867,000
Fair value | 2,018,100 | 2,756,000
Issued 7/3/2012 |  |
Exercise price | $ 5.68 | $ 6.45
Volatility | 48.20% | 69.30%
Risk free interest rate | 0.02% | 0.16%
Term (years) | 3 months 4 days | 1 year 4 days
Discount for Marketability restrictions | 42.80% | 55.50%
Warrants Outstanding | 803,900 | 930,000
Fair value | 34,700 | 509,000
Issued 12/13/2011 |  |
Exercise price | $ 8.92 | $ 12.45
Volatility | 61.00% | 74.40%
Risk free interest rate | 0.63% | 0.54%
Term (years) | 3 years 2 months 16 days | 3 years 11 months 12 days
Discount for Marketability restrictions | 39.90% | 52.30%
Warrants Outstanding | 305,700 | 330,000
Fair value | 318,000 | 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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- Definition Number of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 + Details
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- Definition Agreed upon price for the exchange of the underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 + Details
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