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Common Stock Common Stock (Tables) | 12 Months Ended
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Dec. 31, 2012
Common Stock [Abstract] |
Schedule of reconciliation of changes in common shares issued | A reconciliation of the changes in common shares issued is as follows:
| Year ended December 31,
| 2012 |  | 2011
Shares issued at the beginning of the year | 51,957,652 |  |  | 36,753,891 |
Issued in sale of common stock | — |  |  | 3,665,000 |
Issued upon conversion of preferred stock | — |  |  | 4,871,719 |
Issued in payment of term loan principal | — |  |  | 171,154 |
Issued in exchange of convertible notes | — |  |  | 559,007 |
Issued upon exercise of warrants | 348,350 |  |  | 3,960,747 |
Issued as dividend payments on preferred stock | — |  |  | 624,171 |
Issued as restricted stock award grants | 750,476 |  |  | 1,287,731 |
Issued upon exercise of stock options | 67,500 |  |  | 64,232 |
Shares issued at the end of the year | 53,123,978 |  |  | 51,957,652 |
Schedule of assumptions used in the Black-Scholes model for stock options granted | Assumptions used in the Black-Scholes option pricing model for stock options granted in 2011 and 2010 are as follows:
| Year ended December 31,
|  | 2011 |  | 2010
Risk-free interest rate |  | .94%-1.825% |  |  | .55%-2.275% |
Expected volatility of common stock |  | 67.7%-70.3% |  |  | 61.4%-69.3% |
Expected life of options in years |  | 3.50*-4.00 |  |  | 3.34*-6.25 |
Dividend yield |  | — | % |  | — | %
Vesting period in years |  | 3.5-4.0 |  |  | 3.4-6.3 |
*Grants were made to an optionee for whom the Company was able to reasonably estimate the expected life of the award.
Schedule of stock option activity | A summary of stock option activity for the year ended December 31, 2012 is as follows:
Options |  | Shares |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value
Outstanding as of January 1, 2012 |  | 2,529,690 |  |  | $ | 5.32 |  |  |  |  |
Exercised |  | (67,500 | ) |  | 2.50 |  |  |  |  |
Expired |  | (4,604 | ) |  | 13.81 |  |  |  |  |
Outstanding as of |  |  |  |  |  |  |  |
December 31, 2012 |  | 2,457,586 |  |  | $ | 5.65 |  |  | 7.14 |  | $ | 16,673,502 |
Vested or expected to vest at |  |  |  |  |  |  |  |
December 31, 2012 |  | 2,437,864 |  |  | $ | 5.64 |  |  | 7.14 |  | $ | 16,571,402 |
Options exercisable as of |  |  |  |  |  |  |  |
December 31, 2012 |  | 1,318,436 |  |  | $ | 3.56 |  |  | 6.58 |  | $ | 11,728,379 |
Schedule of restricted stock activity | A summary of restricted stock activity for the year ended December 31, 2012 is as follows:
Restricted Stock |  | Shares |  | Weighted- Average Fair Value - Date of Grant
Non-vested at January 1, 2012 |  | 1,445,858 |  |  | $ | 6.64 |
Granted |  | 750,476 |  |  | 11.03 |
Vested |  | (842,730 | ) |  | 6.51 |
Forfeited |  | (29,314 | ) |  | 10.84 |
Non-vested at December 31, 2012 |  | 1,324,290 |  |  | $ | 9.15 |

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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