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Net Loss Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Schedule of basic and diluted net loss per share |
|  |  | Years ended December 31, |
|  |  | 2016 |  |  | 2017 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  | $ | (11,791) |  |  |  |  | $ | (7,470) |  |
Dividend on convertible exchangeable preferred shares |  |  |  | $ | (200) |  |  |  |  | $ | (201) |  |
Beneficial conversion feature of Series A convertible stock |  |  |  | $ | — |  |  |  |  | $ | (3,638) |  |
Conversion of Series A convertible preferred stock |  |  |  | $ | — |  |  |  |  | $ | (3,537) |  |
Net loss attributable to common shareholders |  |  |  | $ | (11,991) |  |  |  |  | $ | (14,846) |  |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average number of common shares used in loss per share – basic and diluted |  |  |  |  | 3,424,976 |  |  |  |  |  | 7,631,152 |  |
Loss per share – basic and diluted |  |  |  | $ | (3.50) |  |  |  |  | $ | (1.95) |  |
Schedule of company's potential anti dilutive securities |
|  |  | Year ended December 31, |
|  |  | 2016 |  |  | 2017 |
Stock options |  |  |  |  | 389,378 |  |  |  |  |  | 535,616 |  |
Convertible preferred stock |  |  |  |  | 1,698 |  |  |  |  |  | 1,698 |  |
Series A preferred stock |  |  |  |  | — |  |  |  |  |  | 132,000 |  |
Common stock warrants |  |  |  |  | — |  |  |  |  |  | 7,490,500 |  |
Total shares excluded from calculation |  |  |  |  | 391,076 |  |  |  |  |  | 8,159,814 |  |

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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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