Income (Loss) Per Common Share

Basic income (loss) per common share is determined by dividing net income (loss) by the weighted average number of common shares outstanding during the period. Diluted income (loss) per share is determined by dividing net income (loss) by the weighted average number of common shares outstanding, assuming all potentially dilutive shares were issued. We apply the treasury stock method to determine the dilutive weighted average common shares represented by the unvested restricted stock units and ESPP shares.

The following table summarizes the basic and diluted income (loss) per share calculations (in thousands, except per share amounts):



	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2018			2017		2018			2017
Numerator
Net income (loss)	$	(6,999	)	$	2,296	$	(74,835	)	$	(50,317	)
Denominator
Basic weighted average common shares	224,182			223,056		223,912			222,847
Restricted stock units ⁽¹⁾	—			525		—			—
Diluted weighted average common shares⁽¹⁾	224,182			223,581		223,912			222,847
Income (loss) per common share:
Basic	$	(0.03	)	$	0.01	$	(0.33	)	$	(0.23	)
Diluted	$	(0.03	)	$	0.01	$	(0.33	)	$	(0.23	)




⁽¹⁾	Approximate number of unvested restricted stock units and stock to be issued pursuant to the ESPP that have been excluded from the computation of diluted income (loss) per share as the effect would be anti-dilutive when results from operations are at a net loss position.	1,075	—	779	624