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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2017, 2016 and 2015 are as follows:
(in thousands, except share data) |  | 2017 |  |  | 2016 |  |  | 2015 |
Net loss |  | $ | (45,117 | ) |  | $ | (17,971 | ) |  | $ | (14,704 | )
Preferred stock dividends |  |  | (527 | ) |  |  | — |  |  |  | — |
Net loss, adjusted |  |  | (45,644 | ) |  |  | (17,971 | ) |  |  | (14,704 | )
Net loss per share – basic and diluted |  |  | (6.50 | ) |  |  | (3,707 | ) |  |  | (5,096 | )
Weighted average shares outstanding – basic and diluted |  |  | 7,019,316 |  |  |  | 4,847 |  |  |  | 2,887 |
Shares excluded from the computation of diluted EPS | Shares excluded from the computation of diluted EPS:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Stock options |  |  | 127 |  |  |  | 118 |  |  |  | 135 |
Unvested restricted shares |  |  | 283 |  |  |  | 55 |  |  |  | 103 |
Warrants |  |  | 7,005,952 |  |  |  | 20,618 |  |  |  | 3,225 |
Total |  |  | 7,006,362 |  |  |  | 20,791 |  |  |  | 3,463 |

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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