NET LOSS PER SHARE

Basic net loss per share is computed by dividing the net loss attributable to common stockholders for the applicable period by the weighted average number of common shares outstanding during the period. Potentially dilutive shares, consisting of outstanding stock options, restricted stock units, ESPP plan awards as well as the Notes, are excluded from the net loss per share computations when their effect is anti-dilutive.

The following table presents the calculation of basic and diluted net loss per share (in thousands, except per share amounts):



	Year Ended December 31,
	2018			2017			2016
Numerator:
Net loss	$	(21,035	)	$	(82,955	)	$	(72,314	)
Denominator:
Weighted average number of shares outstanding:
Basic and diluted	85,615			80,974			77,705
Net loss per share:
Basic and diluted	$	(0.25	)	$	(1.02	)	$	(0.93	)

The diluted net loss per share is the same as basic net loss per share for the years ended December 31, 2018, 2017 and 2016, as the effect of inclusion of potential common shares outstanding would have been anti-dilutive due to the Company’s net losses for the years presented. The following table sets forth the potential weighted common shares outstanding that were excluded from the computation of basic and diluted net loss per share calculations (in thousands):



	December 31,
	2018	2017	2016
Stock options	3,327	4,470	5,295
Restricted stock units	2,997	3,059	2,536
Stock purchase rights under the ESPP	609	620	659
Warrants ⁽¹⁾	1,268	782	206
Total ⁽²⁾	8,201	8,931	8,696

(1) In 2016, in connection with the execution of a product supply agreement the Company granted Comcast a warrant to purchase shares of its common stock. See Note 16, “Warrants,” for additional information. The warrants will have a dilutive impact on diluted net income per share when the Company’s average market price of its common stock for a given period exceeds the warrant exercise price of $4.76 per share.

(2) Excluded from the table above are the Notes, which are convertible under certain conditions into an aggregate of 22,304,348 shares of common stock. See Note 11, “Convertible Notes, Other Debts and Capital Leases,” for additional information on the Notes. Since the Company’s intent is to settle the principal amount of the Notes in cash, the treasury stock method is being used to calculate any potential dilutive effect of the conversion spread on diluted net income per share, if applicable. The conversion spread will have a dilutive impact on diluted net income per share when the Company’s average market price of its common stock for a given period exceeds the conversion price of $5.75 per share.