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 any unvested restricted shares of common stock. These unvested restricted shares, although classified as issued and outstanding at December 31, 2019 and 2018, are 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 shares of our restricted stock do not contain non-forfeitable rights to dividends and dividend equivalents. Vested RSUs (for which shares of common stock have not yet been delivered) are included in the calculations of basic net loss per share. 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 awards, to the extent they are dilutive. For the year ended December 31, 2019, 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 per share).

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



	Year Ended December 31,
Numerator:	2019			2018
Net loss	$	(7,761	)	$	(7,168	)
Less: preferred stock dividends	27			12
Net loss attributable to common stockholders	$	(7,788	)	$	(7,180	)
Basic and diluted net loss per share	$	(1.52	)	$	(1.50	)

The weighted-average number of shares for the years ended December 31, 2019 and 2018 includes 28,904 and 988,000 shares, respectively, of vested RSUs, as discussed in Note 14 - Stock Based Compensation.

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:



	Year Ended December 31,
	2019	2018
Unvested restricted stock units	23,334	503,500
Outstanding stock options	215,345	118,300
Unvested restricted stock awards	627	11,300
Shares of common stock issuable upon conversion of Series A-2 preferred stock	10,978	11,000
Shares of common stock issuable upon conversion of Series B preferred stock	—	26,800
Shares of common stock issuable upon conversion of Series C preferred stock	158,333	175,000
Shares of common stock issuable upon conversion of Series D preferred stock	17,349,010	—
Shares of common stock issuable upon conversion of Series E preferred stock	1,315,790	—
Warrants	72,394	—