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Net Loss Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Net Loss Per Share |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (in thousands, except per share amounts) |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net loss available to common stockholders |  | $ | (6,661 | ) |  | $ | (15,343 | ) |  | $ | (2,602 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding - basic |  |  | 13,489 |  |  |  | 11,951 |  |  |  | 11,486 |
Potential common shares - options (treasury stock method) |  |  | — |  |  |  | — |  |  |  | — |
Weighted average shares outstanding - diluted |  |  | 13,489 |  |  |  | 11,951 |  |  |  | 11,486 |
Shares excluded (anti-dilutive) |  |  | — |  |  |  | — |  |  |  | 17 |
Shares excluded due to an exercise price greater than weighted average stock price for the period |  |  | 1,839 |  |  |  | 2,094 |  |  |  | 383 |
Net loss per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | (0.49 | ) |  | $ | (1.28 | ) |  | $ | (0.23 | )
Diluted |  | $ | (0.49 | ) |  | $ | (1.28 | ) |  | $ | (0.23 | )

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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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