Net Loss Per Share

Basic net loss per share is computed by dividing net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period. The weighted-average number of shares of common stock outstanding does not include any potentially dilutive securities or unvested restricted stock. Unvested restricted stock, although classified as issued and outstanding at September 30, 2019 and 2018, is considered contingently returnable until the restrictions lapse and will not be included in the basic net loss per share calculation until the shares are vested. Unvested restricted stock does not contain non-forfeitable rights to dividends and dividend equivalents. Unvested RSUs are not included in calculations of basic net loss per share, as they are not considered issued and outstanding at time of grant.

Diluted net loss per share is computed by giving effect to all potential shares of common stock, including stock options, preferred stock, RSUs, and unvested restricted stock, to the extent they are dilutive. For the three and nine months ended September 30, 2019 and 2018, all such common stock equivalents have been excluded from diluted net loss per share as the effect to net loss per share would be anti-dilutive (due to the net loss).

The following table sets forth the computation of the Company’s basic and diluted net loss per share (in thousands, except per share data):



	Three Months Ended September 30,						Nine Months Ended September 30,
	2019			2018			2019			2018
Numerator:
Net loss	$	(640	)	$	(1,470	)	$	(2,113	)	$	(4,444	)
Less: preferred stock dividends	4			3			23			9
Net loss attributable to common stockholders	$	(644	)	$	(1,473	)	$	(2,136	)	$	(4,453	)
Denominator:
Weighted-average number of shares of common stock for basic and diluted net loss per share	5,184			4,885			5,128			4,749
Basic and diluted net loss per share	$	(0.12	)	$	(0.30	)	$	(0.42	)	$	(0.94	)

The weighted-average number of shares for all periods presented includes 54,370 shares of vested RSUs, respectively, as discussed in Note 7.

The following table represents the potential shares that were excluded from the computation of weighted-average number of shares of common stock in computing the diluted net loss per share for the periods presented because including them would have had an anti-dilutive effect:



	Nine Months Ended September 30,
	2019	2018
Unvested restricted stock units	23,334	213,700
Unvested restricted stock awards	627	11,300
Outstanding stock options	107,525	118,300
Shares of common stock issuable upon conversion of Series A-2 Preferred	10,978	11,000
Shares of common stock issuable upon conversion of Series B Preferred	—	133,900
Shares of common stock issuable upon conversion of Series C Preferred	158,333	258,300
Total	300,797	746,500