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Net Loss per Share (Tables)
 6 Months Ended
Jun. 30, 2016
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 six months ended June 30, 2016, and 2015 (in thousands except share and per share amounts) :
 
 
 
Three months ended June 30, 2016
 
Six months ended June 30, 2016
 
 
 
Net loss
 (Numerator)
 
Shares
(Denominator)
 
Per Share
Amount
 
Net Loss
(Numerator)
 
Shares
(Denominator)
 
Per Share
Amount
 
Net loss - Basic
 
$
(5,764)
 
 
91,015,733
 
$
(0.06)
 
$
(16,842)
 
 
90,921,243
 
$
(0.18)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Change in fair value of warrant liability
 
$
(3,513)
 
 
-
 
$
-
 
$
(3,015)
 
 
-
 
$
-
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Dilutive shares related to warrants
 
$
-
 
 
2,914,807
 
$
-
 
$
-
 
 
1,729,974
 
$
-
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss - Dilutive
 
$
(9,277)
 
 
93,930,540
 
$
(0.10)
 
$
(19,857)
 
 
92,651,215
 
$
(0.21)
 
 
 
 
Three months ended June 30, 2015
 
Six months ended June 30, 2015
 
 
 
Net loss
(Numerator)
 
Shares
(Denominator)
 
Per Share
Amount
 
Net Loss
(Numerator)
 
Shares
(Denominator)
 
Per Share
Amount
 
Net loss - Basic
 
$
(13,623)
 
 
72,736,829
 
$
(0.19)
 
$
(25,981)
 
 
72,674,650
 
$
(0.36)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Change in fair value of warrant liability
 
$
-
 
 
-
 
$
-
 
$
-
 
 
-
 
$
-
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Dilutive shares related to warrants
 
$
-
 
 
-
 
$
-
 
$
-
 
 
-
 
$
-
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss - Dilutive
 
$
(13,623)
 
 
72,736,829
 
$
(0.19)
 
$
(25,981)
 
 
72,674,650
 
$
(0.36)