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Net Loss Per Share | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Net Loss Per Share | 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 June 30, 2021 and 2020, 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 six months ended June 30, 2021 and 2020, 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 June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Numerator: |  |  |  |  |  |  |
Net loss | $ | (2,246) |  |  | $ | (3,385) |  |  | $ | (5,679) |  |  | $ | (6,514) |
Less: preferred stock dividends | — |  |  | (4) |  |  | (1) |  |  | (8) |
Less: undeclared dividends | — |  |  | — |  |  | $ | (366) |  |  | $ | — |
Less: loss on induced conversion of Series A-2 Preferred Stock | — |  |  | — |  |  | $ | (300) |  |  | $ | — |
Net loss attributable to common stockholders | $ | (2,246) |  |  | $ | (3,389) |  |  | $ | (6,346) |  |  | $ | (6,522) |
Denominator: |  |  |  |  |  |  |
Weighted-average number of shares of common stock for diluted net loss per share | 26,644 |  |  | 5,240 |  |  | 22,250 |  |  | 5,222 |
Basic and diluted net loss per share | $ | (0.08) |  |  | $ | (0.65) |  |  | $ | (0.29) |  |  | $ | (1.25) |
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):
| Six Months Ended
| June 30,
| 2021 |  | 2020
Outstanding stock options | 407,500 |  |  | 215,345 |
Unvested restricted stock awards | 627 |  |  | 627 |
Shares of common stock issuable upon conversion of Series A-2 preferred stock | — |  |  | 15,545 |
Shares of common stock issuable upon conversion of Series C preferred stock | — |  |  | 108,333 |
Shares of common stock issuable upon conversion of Series D preferred stock | — |  |  | 17,030,960 |
Shares of common stock issuable upon conversion of Series E preferred stock | — |  |  | 1,315,790 |
Warrants | 5,146,500 |  |  | 72,394 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3630-109257 + Details
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