12.	Net Income (Loss) per Share Attributable to Sterling Common Stockholders

Basic net income (loss) per share attributable to Sterling common stockholders is computed by dividing net income (loss) attributable to Sterling common stockholders by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per common share attributable to Sterling common stockholders is the same as basic net income (loss) per share attributable to Sterling common stockholders but includes dilutive unvested stock and warrants using the treasury stock method. The following table reconciles the numerators and denominators of the basic and diluted per common share computations for net income (loss) attributable to Sterling common stockholders (amounts in thousands, except per share data):

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
Numerator:
Net income (loss) attributable to Sterling common stockholders	$	3,662	$	2,023	$	1,405	$	(5,305	)
Weighted average common shares outstanding — basic		26,978		22,762		25,972		21,261
Shares for dilutive unvested stock and warrants		358		197		437		-
Weighted average common shares outstanding and incremental shares assumed repurchased— diluted		27,336		22,959		26,409		21,261
Basic income (loss) per share attributable to Sterling common stockholders	$	0.14	$	0.09	$	0.05	$	(0.25	)
Diluted income (loss) per share attributable to Sterling common stockholders	$	0.13	$	0.09	$	0.05	$	(0.25	)

In accordance with the treasury stock method approximately

0.2

million shares of unvested common stock were excluded from the diluted weighted average common shares outstanding for the

six

months ended

June 30, 2016,

as the Company incurred a loss during that period and the impact of such shares would have been antidilutive. Approximately,

1.0

million shares of common stock related to our Warrant issuance were excluded from the diluted weighted average common shares outstanding for the

three

months and

six

months ended

June 30, 2017,

as the shares were out of the money and considered anti-dilutive.