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Net Loss per Share | 3 Months Ended
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Mar. 31, 2019
Earnings Per Share [Abstract] |
Earnings Per Share [Text Block] | 6. Net Loss per Share Basic net loss per share is computed by dividing net loss by the weighted average number of common shares outstanding. Included in net loss is the Series A preferred dividend from preferred shares issuance of $61,000 and $59,000 for the three months ended March 31, 2019 and 2018 , respectively. Net loss for the three months ended March 31, 2019 also includes the Series B deemed dividend of $398,000. The deemed dividend relates to the discount provided to preferred stockholders upon conversion of their preferred stock to common shares and is subtracted from net loss (see Note 8) . Diluted net loss per share is computed by dividing net loss by the weighted average number of common shares outstanding including the effect of common share equivalents. Diluted net loss per share assumes the issuance of potentially dilutive common shares outstanding for the period and adjusts for any changes in income and the repurchase of common shares that would have occurred from the assumed issuance, unless such effect is anti-dilutive. The number of options and warrants for the purchase of common stock that were excluded from the computations of net loss per common share for the three months ended March 31, 2019 were 893,367 and 18,915,851, respectively, and for the three months and ended March 31, 2018 were 348,244 and 915,852, respectively. 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 months ended March 31, 2019 and 2018 (in thousands except share and per share amounts) :
|  | Three months ended March 31, 2019 |  |  | Three months ended March 31, 2018 |
|  | Net loss (Numerator) |  |  | Shares (Denominator) |  |  | Per Share Amount |  |  | Net Loss (Numerator) |  |  | Shares (Denominator) |  |  | Per Share Amount |
Net loss - Basic |  | $ | (3,971 | ) |  |  | 15,656,784 |  |  | $ | (0.25 | ) |  | $ | (2,375 | ) |  |  | 3,673,340 |  |  | $ | (0.65 | )
Dilutive shares related to warrants |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Net loss - Dilutive |  | $ | (3,971 | ) |  |  | 15,656,784 |  |  | $ | (0.25 | ) |  | $ | (2,375 | ) |  |  | 3,673,340 |  |  | $ | (0.65 | )

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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