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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Calculation of net loss and number of shares used to compute basic and diluted earnings per share | 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 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 |
Shares Excluded from the Computation of Diluted Earnings per Share | 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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- 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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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + 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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