8. Net Loss per Share

Diluted net loss per share is the same as basic net loss per share for all periods presented because the effects of potentially dilutive items were anti-dilutive, given the Company’s net loss. The following securities have been excluded from the calculation of weighted-average shares of common stock outstanding because the effect is anti-dilutive for the three and six months ended June 30, 2016 and 2015:

	Three and Six Months Ended June 30,
	2016	2015
Stock options	5,358,182	5,958,578
Restricted stock units	1,421,372	1,236,153

Basic and diluted net loss per share is calculated as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2016			2015			2016			2015
Numerator (in thousands):
Net loss	$	(8,337	)	$	(9,630	)	$	(11,717	)	$	(15,098	)

Denominator:
Weighted-average shares of common stock outstanding, basic and diluted	46,494,464			41,362,476			46,226,117			41,171,669

Net loss per share, basic and diluted	$	(0.18	)	$	(0.23	)	$	(0.25	)	$	(0.37	)