2. Net Loss per Share

Basic net loss per share is computed by dividing net loss by the weighted average number of common shares outstanding for the period. Diluted net loss per share is computed by giving effect to all potential dilutive common stock equivalents outstanding for the period. For purposes of this calculation, options to purchase common stock, restricted stock units (“RSUs”), Employee Stock Purchase Plan (“ESPP”), and the Conversion Option of the 2022 Notes (Note 7) are considered to be potential common stock equivalents.

A reconciliation of the denominator used in the calculation of basic and diluted net loss per share is as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
		2017			2016			2017			2016
Net loss	$	(10,583	)	$	(10,515	)	$	(28,179	)	$	(31,733	)
Weighted-average common shares outstanding — basic		37,047			35,393			36,639			35,038
Dilutive effect of share equivalents resulting from stock options, RSUs, ESPP and the Conversion Option of the 2022 Notes		—			—			—			—
Weighted-average common shares, outstanding — diluted		37,047			35,393			36,639			35,038
Net loss per share, basic and diluted	$	(0.29	)	$	(0.30	)	$	(0.77	)	$	(0.91	)

Additionally, since the Company incurred net losses for each of the periods presented, diluted net loss per share is the same as basic net loss per share. The Company’s outstanding stock options, RSUs, ESPP, and Conversion Option of the 2022 Notes were not included in the calculation of diluted net loss per share as the effect would be anti-dilutive. The following table contains all potentially dilutive common stock equivalents.

	As of September 30,
		2017	2016
	(in thousands)
Options to purchase common shares		2,398	2,818
RSUs		2,173	2,364
ESPP		3	5

The Company expects to settle the principal amount of the 2022 Notes in cash, and therefore, the Company uses the treasury stock method for calculating any potential dilutive effect of the Conversion Option on diluted net income per share, if applicable. The Conversion Option will have a dilutive impact on net income per share of common stock when the average market price of the Company’s common stock for a given period exceeds the conversion price of the 2022 Notes of $94.77 per share. During the three and nine months ended September 30, 2017, the Company's weighted average common stock price was below the conversion price of the 2022 Notes.