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Stock Options - Non-vested Share-based Activity (Details) - Employee Consultants and Directors Stock Options [Member] - $ / shares | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Non-vested share-based payment activity with employees |  |  |
Number of non-vested options outstanding at the beginning of the period (in shares) | 1,159,486 | 675,196 |
Number of non-vested options granted (in shares) | 946,250 | 935,750 | 935,750
Number of options vested (in shares) | (635,289) | (407,437) |
Number of non-vested options forfeited (in shares) | (290,478) | (44,023) |
Number of non-vested options outstanding at the end of the period (in shares) | 1,179,969 | 1,159,486 | 675,196
Weighted average grant-date fair value of non-vested options outstanding at the beginning of the period (in dollars per share) | $ 3.37 | $ 2.88 |
Weighted average grant-date fair value of options granted (in dollars per share) | 4.31 | 3.57 |
Weighted average grant-date fair value of options vested (in dollars per share) | (3.32) | (3.03) |
Weighted average grant-date fair value of non-vested options forfeited (in dollars per share) | (3.12) | (3.78) |
Weighted average grant-date fair value of non-vested options outstanding at the end of the period (in dollars per share) | $ 4.21 | $ 3.37 | $ 2.88

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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + 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 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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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Number of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options outstanding. + References No definition available. + Details
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- Definition Number of options vested. + References No definition available. + Details
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- Details
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