NET INCOME (LOSS) PER SHARE

For the years ended December 31, 2018 and 2017, the Company incurred net losses and, therefore, the effect of the Company's outstanding stock options and unvested RSUs were not included in the calculation of diluted net income (loss) per share as the effect would be anti-dilutive.

The following table summarizes the calculation of basic and diluted net income (loss) per share for the years ended December 31, 2019, 2018 and 2017 (in thousands, except share and per share data):



	2019		2018			2017
Basic:
Net income (loss)	$	3,482	$	(7,601	)	$	(16,557	)
Weighted average common shares outstanding, basic	27,886,278		27,138,274			26,366,748
Basic net income (loss) per share	$	0.12	$	(0.28	)	$	(0.63	)
Diluted:
Net income (loss)	$	3,482	$	(7,601	)	$	(16,557	)
Weighted average common shares outstanding, basic	27,886,278		27,138,274			26,366,748
Dilutive effect of:
Stock options	167,208		—			—
Unvested RSUs	763,491		—			—
Diluted weighted average common shares outstanding	28,816,977		27,138,274			26,366,748
Diluted net income (loss) per share	$	0.12	$	(0.28	)	$	(0.63	)

The following equity instruments have been excluded from the calculation of diluted net income (loss) per share because the effect is anti-dilutive for the years ended December 31, 2019, 2018 and 2017:



	2019	2018	2017
Stock options	1,626,757	2,208,141	2,108,392
RSUs	278,937	2,216,430	2,481,037