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Net Loss per Share (Tables) | 3 Months Ended
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Mar. 31, 2019
Earnings Per Share [Abstract] |
Summary of Basic and Diluted Net Loss per Share Attributable to Common Stockholders | Basic and diluted net loss per share attributable to common stockholders was calculated as follow:
|  | Three Months Ended March 31, |
|  | 2019 |  |  | 2018 |
Numerator: |  |  |  |  |  |  |  |
Net loss |  | $ | (10,873 | ) |  | $ | (7,367 | )
Accruing dividends on Series A convertible preferred stock |  |  | (592 | ) |  |  | (740 | )
Net loss attributable to common stockholders |  | $ | (11,465 | ) |  | $ | (8,107 | )
Denominator: |  |  |  |  |  |  |  |
Weighted average common shares outstanding—basic and diluted |  |  | 1,717,808 |  |  |  | 457,971 |
Net loss per share attributable to common stockholders—basic and diluted |  | $ | (6.67 | ) |  | $ | (17.70 | )
Schedule of Anti-dilutive Securities Excluded from Computation of Diluted Net Loss per Share Attributable to Common Stockholders | The Company excluded the following potential common shares, presented based on amounts outstanding at each period end and adjusted for the Exchange Ratio and Reverse Stock Split, from the computation of diluted net loss per share attributable to common stockholders for the periods indicated because including them would have had an anti-dilutive effect:
|  | Three Months Ended March 31, |
|  | 2019 |  |  | 2018 |
Options to purchase common stock |  |  | 1,037,089 |  |  |  | 538,429 |
Convertible preferred stock (as converted to common stock) |  |  | — |  |  |  | 3,556,147 |
Warrants to purchase common stock (presented on an as-converted, as exchanged, split-adjusted basis. |  |  | 493,927 |  |  |  | 423,416 |
|  |  | 1,531,016 |  |  |  | 4,517,992 |

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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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