15. Net Loss Per Share

The following table sets forth the computation of basic and diluted net loss per share of common stock (in thousands, except per share data):


	Three months ended September 30,				Nine months ended September 30,
	2019		2018		2019		2018
Net loss	$	(4,485)	$	(6,035)	$	(21,533)	$	(18,253)
Weighted average common shares outstanding—basic and diluted		26,089		25,111		25,868		24,315
Net loss per share—basic and diluted	$	(0.17)	$	(0.24)	$	(0.83)	$	(0.75)

For the three months ended September 30, 2019 and 2018, we excluded 5.0 million and 1.8 million shares, respectively, and for the nine months ended September 30, 2019 and 2018, we excluded 5.0 million and 2.4 million shares, respectively, from the calculation of diluted weighted average common shares outstanding, as their inclusion would have been antidilutive.

For the three months ended September 30, 2019 and 2018, had we reported net income, approximately 0.1 million and 1.4 million common shares would have been included in the number of shares used to calculate earnings per share, respectively. For the nine months ended September 30, 2019 and 2018, had we reported net income, approximately 0.4 million and 1.2 million common shares would have been included in the number of shares used to calculate earnings per share, respectively.