The following table summarizes the computation of basic and diluted net loss per share (in thousands, except share and per share data):


	Years Ended December 31,
	2018			2017			2016
Net loss	$	(49,205	)	$	(36,658	)	$	(31,778	)
Weighted average shares outstanding		30,051,961			29,424,360			28,492,091
Less: weighted average shares subject to repurchase		—			(306	)		(7,088	)
Weighted average shares used to compute basic and diluted net loss per share		30,051,961			29,424,054			28,485,003
Net loss per share, basic and diluted	$	(1.64	)	$	(1.25	)	$	(1.12	)

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 dividing net loss by the weighted-average number of common shares and potentially dilutive securities outstanding for the period, determined using the treasury-stock method, if inclusion of these is dilutive. Because the Company has reported a net loss for all periods presented, diluted net loss per common share is the same as basic net loss per common share for those periods.

The following potentially dilutive securities outstanding at the end of the periods presented have been excluded from the computation of diluted shares outstanding:

	December 31,
	2018		2017		2016
Unreleased restricted stock		1,010,123		720,840		345,555
Options to purchase common stock		2,529,740		2,559,972		2,821,227
Convertible senior notes		1,790,033		1,790,033		1,790,033
Warrants related to the issuance of convertible senior notes		1,790,033		1,790,033		1,790,033
Total		7,119,929		6,860,878		6,746,848

Additionally, since the Company expects to settle the principal amount of its outstanding convertible senior notes in cash, the Company uses the treasury stock method for calculating 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 of common stock when the average market price of the Company’s common stock for a given period exceeds the conversion price of $96.37 per share for the 2021 Notes, which has not occurred as of December 31, 2018. In connection with the issuance of the 2021 Notes, the Company entered into convertible bond hedges. The convertible bond hedges are not included for purposes of calculating the number of diluted shares outstanding, as their effect would be anti-dilutive. The convertible bond hedges are generally expected, but not guaranteed, to reduce the potential dilution and/or offset the cash payments the Company is required to make upon conversion of the 2021 Notes.