Net Loss per Share (Tables)

9 Months Ended

Sep. 30, 2017

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, 2017 and 2016 (in thousands except share and per share amounts):

	Three months ended September 30, 2017						Nine months ended September 30, 2017
	Net loss		Shares		Per Share		Net Loss		Shares		Per Share
	(Numerator)		(Denominator)		Amount		(Numerator)		(Denominator)		Amount
Net loss - Basic	$	(17,823)		128,279,674	$	(0.14)	$	(24,925)		122,950,397	$	(0.20)
Dilutive shares related to warrants	$	-		-	$	-	$	-		-	$	-
Net loss - Dilutive	$	(17,823)		128,279,674	$	(0.14)	$	(24,925)		122,950,397	$	(0.20)

	Three months ended September 30, 2016						Nine months ended September 30, 2016
	Net loss		Shares		Per Share		Net Loss		Shares		Per Share
	(Numerator)		(Denominator)		Amount		(Numerator)		(Denominator)		Amount
Net loss - Basic	$	(8,353)		91,441,687	$	(0.09)	$	(24,880)		91,095,990	$	(0.27)
Dilutive shares related to warrants	$	-		-	$	-	$	-		-	$	-
Net loss - Dilutive	$	(8,353)		91,441,687	$	(0.09)	$	(24,880)		91,095,990	$	(0.27)