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Net Loss Per Share Attributable to Common Stockholders (Tables) | 3 Months Ended
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Mar. 30, 2019
Earnings Per Share [Abstract] |
Schedule of basic and diluted net loss per common share | Basic and diluted net loss per common share was the same for each period presented, as the inclusion of all potential common shares outstanding would have been antidilutive.
(in thousands, except share and per share amounts) |  | Three Months Ended
| March 30, 2019 |  | March 31, 2018
Numerator: |  |  |  |
Net loss attributable to common stockholders |  | $ | (6,649 | ) |  | $ | (5,696 | )
Denominator: |  |  |  |
Weighted average common shares outstanding—basic |  | 6,974,301 |  |  | 5,793,801 |
Dilutive effect of stock equivalents resulting from stock options, common stock warrants, preferred stock warrants and convertible preferred stock (as converted) |  | — |  |  | — |
Weighted average common shares outstanding—diluted |  | 6,974,301 |  |  | 5,793,801 |
Net loss per common share—basic and diluted |  | $ | (0.95 | ) |  | $ | (0.98 | )
Schedule of antidilutive securities excluded from computation of earnings per share | The following weighted-average outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share attributable to common stockholders for the periods presented because the impact of including them would have been antidilutive:
|  | March 30, 2019 |  | March 31, 2018
Convertible preferred stock (as converted) |  | 41,562,111 |  |  | 39,474,156 |
Preferred stock warrants (as converted to common stock warrants and subsequently exercised) |  | 160,767 |  |  | 160,767 |
Common stock warrants (as exercised) |  | 60,002 |  |  | — |
Total |  | 41,782,880 |  |  | 39,634,923 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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