We compute net loss per share by dividing our net loss (the numerator) by the weighted-average number of common shares outstanding (the denominator) during the period. Shares issued during the period and shares reacquired during the period, if any, are weighted for the portion of the period that they were outstanding. The computation of diluted earnings per share, or EPS, is similar to the computation of basic EPS except that the denominator is increased to include the number of additional common shares that would have been outstanding if the dilutive potential common shares had been issued. Our diluted EPS is the same as basic EPS due to common equivalent shares being excluded from the calculation, as their effect is anti-dilutive.

 

The following table summarizes our calculation of net loss per common share for the periods (in thousands, except share and per share data):

 

		Three Months Ended June 30,								Six Months Ended June 30,
		2019				2018				2019				2018
Net loss		$	(2,469	)		$	(1,735	)		$	(5,721	)		$	(2,385	)
Weighted average shares outstanding—basic and diluted			11,979,401				7,821,496				11,968,200				7,187,659
Basic and diluted net loss per share		$	(0.21	)		$	(0.22	)		$	(0.48	)		$	(0.33	)

 

The following outstanding potential common shares were included in the diluted net loss per share calculations as their effects were dilutive:

 

		Three Months Ended June 30,								Six Months Ended June 30,
		201 9				201 8				201 9				201 8
Employee and non-employee stock options			1,249,559				627,484				1,249,559				627,484
Common shares issuable under common share purchase warrants			807,563				831,251				807,563				831,251
Common shares issuable under deferred unit plan			21,183				21,183				21,183				21,183