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Summary of Significant Accounting Policies (Tables) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2019 | Dec. 31, 2018
Accounting Policies [Abstract] |  |
Calculation of net loss and number of shares used to compute basic and diluted earnings per share | Basic net loss per share is determined by dividing net loss by the weighted average shares of common stock outstanding during the period, without consideration of potentially dilutive securities except for those shares that are issuable for little or no cash consideration. Diluted net loss per share is determined by dividing net loss by diluted weighted average shares outstanding. Diluted weighted average shares reflects the dilutive effect, if any, of potentially dilutive common shares, such as stock options and warrants calculated using the treasury stock method. In periods with reported net operating losses, all common stock options and warrants are generally deemed anti-dilutive such that basic net loss per share and diluted net loss per share are equal. However, in certain periods in which the exercise price of the warrants was less than the last reported sales price of Delcath’s common stock on the final trading day of the period and there is a gain recorded pursuant to the change in fair value of the warrant derivative liability, the impact of gains related to the mark-to-market adjustment of the warrants outstanding at the end of the period is reversed and the treasury stock method is used to determine diluted earnings per share.
|  | June 30, |
(in thousands, except share data) |  | 2019 |  |  | 2018 |
Net (loss) income—basic |  | $ | (13,853 | ) |  | $ | 527 |
Adjustment for gain on warrant income |  |  | — |  |  |  | (619 | )
Net loss—diluted |  | $ | (13,853 | ) |  | $ | (92 | )
Weighted average shares outstanding—basic* |  |  | 72,069,390 |  |  |  | 788,512 |
Weighted average shares outstanding—diluted* |  |  | 72,069,390 |  |  |  | 799,430 |
Net loss per share—basic* |  | $ | (0.19 | ) |  | $ | 0.67 |
Net loss per share—diluted* |  | $ | (0.19 | ) |  | $ | (0.12 | )
| * | reflects a one-for-five hundred (1:500) reverse stock split effected on May 2, 2018.
| The calculation of net loss and the number of shares used to compute basic and diluted earnings per share for the years ended December 31, 2018 and 2017:
|  | December 31, |
(in thousands, except share data) |  | 2018 |  |  | 2017 |
Net loss—basic |  | $ | (19,222 | ) |  | $ | (45,117 | )
Preferred stock dividends |  |  | — |  |  |  | (527 | )
Net loss—diluted |  | $ | (19,222 | ) |  | $ | (45,644 | )
Weighted average shares outstanding—basic |  |  | 26,705,375 |  |  |  | 14,039 |
Weighted average shares outstanding—diluted |  |  | 26,705,375 |  |  |  | 14,039 |
Net loss per share—basic |  | $ | (0.72 | ) |  | $ | (3,250 | )
Net loss per share—diluted |  | $ | (0.72 | ) |  | $ | (3,250 | )
Summary of Reconciliation of Weighted Average Shares Outstanding Calculation | The following table provides a reconciliation of the weighted average shares outstanding calculation for the three and six months ended June 30, 2019:
|  | Three months ended June 30, 2019 |  |  | Six months ended June 30, 2019 |
Weighted average shares issued |  |  | 17,910,886 |  |  |  | 18,676,912 |
Weighted average pre-funded warrants |  |  | 53,392,478 |  |  |  | 53,392,478 |
Weighted average shares outstanding |  |  | 71,303,364 |  |  |  | 72,069,390 |
| The following table provides a reconciliation of the weighted average shares outstanding calculation at December 31, 2018:
|  | December 31, 2018 |
Weighted average shares issued |  |  | 2,738,944 |
Weighted average pre-funded warrants |  |  | 23,966,431 |
Weighted average shares outstanding |  |  | 26,705,375 |
Anti-dilutive securities excluded from the computation of earnings per share | The following potentially dilutive securities were excluded from the computation of earnings per share as of June 30, 2019 and 2018 because their effects would be anti-dilutive:
|  | June 30, |
|  | 2019 |  |  | 2018 |
Stock options |  |  | 1,166,667 |  |  |  | — |
Common stock warrants—equity |  |  | 4,202,909 |  |  |  | — |
Common stock warrants—liability |  |  | 125,029 |  |  |  | 2,116,296 |
Assumed conversion of convertible notes |  |  | 335,697 |  |  |  | 1,116,255 |
Total |  |  | 5,830,302 |  |  |  | 3,232,551 |
| Shares excluded from the computation of diluted earnings per share:
|  | 2018 |  |  | 2017 |
Common stock warrants—equity |  |  | 4,202,909 |  |  |  | 14,049 |
Common stock warrants—liability |  |  | 189,029 |  |  |  | — |
Assumed conversion of convertible notes |  |  | 2,576,203 |  |  |  | — |
Total |  |  | 6,968,141 |  |  |  | 14,049 |

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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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