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Net Loss per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following tables set forth the computation of diluted net loss per weighted average number of shares outstanding attributable to Synthetic Biologics, Inc. and Subsidiaries for the three and nine months ended September 30, 2018 and 2017 (in thousands except share and per share amounts) :
|  | Three months ended September 30, 2018 |  |  | Nine months ended September 30, 2018 |
|  | Net loss (Numerator) |  |  | Shares (Denominator) |  |  | Per Share Amount |  |  | Net Loss (Numerator) |  |  | Shares (Denominator) |  |  | Per Share Amount |
Net loss - Basic |  | $ | (3,741 | ) |  |  | 4,028,304 |  |  | $ | (0.93 | ) |  | $ | (10,375 | ) |  |  | 3,802,812 |  |  | $ | (2.73 | )
Dilutive shares related to warrants |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Net loss - Dilutive |  | $ | (4,214 | ) |  |  | 4,028,304 |  |  | $ | (0.93 | ) |  | $ | (10,375 | ) |  |  | 3,802,812 |  |  | $ | (2.73 | )
|  | Three months ended September 30, 2017 |  |  | Nine months ended September 30, 2017 |
|  | Net loss (Numerator) |  |  | Shares (Denominator) |  |  | Per Share Amount |  |  | Net Loss (Numerator) |  |  | Shares (Denominator) |  |  | Per Share Amount |
Net loss - Basic |  | $ | (17,823 | ) |  |  | 3,665,134 |  |  | $ | (4.90 | ) |  | $ | (24,925 | ) |  |  | 3,512,868 |  |  | $ | (7.00 | )
Dilutive shares related to warrants |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Net loss - Dilutive |  | $ | (17,823 | ) |  |  | 3,665,134 |  |  | $ | (4.90 | ) |  | $ | (24,925 | ) |  |  | 3,512,868 |  |  | $ | (7.00 | )

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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