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Net (Loss) Income Per Share Available to Common Stockholders (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Outstanding Securities Considered Anti-Dilutive | The following table shows the weighted-average outstanding securities considered anti-dilutive and therefore excluded from the computation of diluted net (loss) income per share available to common stockholders (in thousands):
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |
Convertible preferred stock |  |  | 5,048 |  |  |  | 4,372 |
Common stock options and RSUs |  |  | 1,639 |  |  |  | 346 |
Warrants for common stock |  |  | 21 |  |  |  | 100 |
Total |  |  | 6,708 |  |  |  | 4,818 |
Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Income (Loss) per Share Available to Common Stockholders | The following is a reconciliation of the numerator (net income or loss) and denominator (number of shares) used in the calculation of basic and diluted net (loss) income per share available to common stockholders (in thousands):
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |
Numerator |  |  |  |  |  |  |  |
Net (loss) income |  | $ | (13,343 | ) |  | $ | 14,596 |
Less: Deemed dividend on convertible preferred stock |  |  | — |  |  |  | (5,603 | )
Less: Allocation of undistributed earnings to participating securities |  |  | — |  |  |  | (3,279 | )
Net (loss) income available to common stockholders, basic |  | $ | (13,343 | ) |  | $ | 5,714 |
Adjustments to undistributed earnings allocated to participating securities |  |  | — |  |  |  | 96 |
Net (loss) income available to common stockholders, diluted |  | $ | (13,343 | ) |  | $ | 5,810 |
Denominator |  |  |  |  |  |  |  |
Weighted average shares used in computing basic net (loss) income per share available to common stockholders |  |  | 8,373 |  |  |  | 7,619 |
Effect of dilutive stock options |  |  | — |  |  |  | 360 |
Effect of dilutive warrants |  |  | — |  |  |  | 1 |
Weighted average shares used in computing diluted net (loss) income per share available to common stockholders |  |  | 8,373 |  |  |  | 7,980 |
Basic net (loss) income per share of common stock |  | $ | (1.59 | ) |  | $ | 0.75 |
Diluted net (loss) income per share of common stock |  | $ | (1.59 | ) |  | $ | 0.73 |

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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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