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 March 31, 2020 and 2019, 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 months ended March 31, 2020 and 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).

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 March 31,
	2020			2019
Numerator:
Net loss	$	(3,129	)	$	(598	)
Less: preferred stock dividends	(4		)	(15		)
Net loss attributable to common stockholders	$	(3,133	)	$	(613	)
Denominator:
Weighted-average number of shares of common stock for diluted net loss per share	5,204			5,104
Basic and diluted net loss per share	$	(0.60	)	$	(0.12	)

The weighted-average number of shares for the three months ended March 31, 2020 and 2019 includes 28,904 and 98,763 shares of vested RSUs, respectively, as discussed in Note 10 - 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 (due to the net loss):



	Three Months Ended
	March 31,
	2020	2019
Unvested restricted stock units	23,334	539,394
Outstanding stock options	215,345	117,902
Unvested restricted stock awards	627	11,318
Shares of common stock issuable upon conversion of Series A-2 preferred stock	10,978	79,043
Shares of common stock issuable upon conversion of Series C preferred stock	108,333	158,333
Shares of common stock issuable upon conversion of Series D preferred stock	1,720,460	—
Shares of common stock issuable upon conversion of Series E preferred stock	1,315,790	—
Warrants	72,394	—