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Schedule II - Valuation and qualifying accounts | 12 Months Ended
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Dec. 31, 2012
Schedule II - Valuation and qualifying accounts [Abstract] |
Schedule II - Valuation and qualifying accounts | YEARS ENDED DECEMBER 31, 2012, 2011 AND 2010
Note Description |  | Balance at Beginning of Year |  |  | Additions |  |  | Deductions |  |  | Balance at End of Year |
Year ended December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax valuation allowance |  | $ | 39,133,355 |  |  | $ | 10,467,065 |  |  |  |  |  |  | $ | 49,600,420 |
Year ended December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax valuation allowance |  | $ | 35,235,982 |  |  | $ | 3,897,373 |  |  |  |  |  |  | $ | 39,133,355 |
Year ended December 31, 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax valuation allowance |  | $ | 14,933,519 |  |  | $ | 20,302,463 |  |  |  |  |  |  | $ | 35,235,982 |

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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