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Net Loss Per Share Attributable to Common Stockholders (Tables) | 9 Months Ended
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Sep. 30, 2019
Earnings Per Share [Abstract] |
Schedule of Computation of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30 |  |  | September 30 |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss allocable to common stockholders |  | $ | (6,768 | ) |  | $ | (947 | ) |  | $ | (19,057 | ) |  | $ | (12,108 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average shares used in computing net loss per share, basic and diluted |  |  | 20,356,447 |  |  |  | 1,037,090 |  |  |  | 18,085,719 |  |  |  | 1,035,927 |
Net loss per share, basic and diluted |  | $ | (0.33 | ) |  | $ | (0.91 | ) |  | $ | (1.05 | ) |  | $ | (11.69 | )
Summary of Potentially Dilutive Common Shares were Excluded from Calculation of Diluted Net Loss Per Share | The potentially dilutive common shares that were excluded from the calculation of diluted net loss per share because their effect would have been antidilutive for the three and nine months ended September 30, 2019 and 2018, respectively, are as follows:
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30 |  |  | September 30 |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Shares of convertible preferred stock |  |  | — |  |  |  | 12,217,459 |  |  |  | — |  |  |  | 12,217,459 |
Shares subject to options to purchase common stock |  |  | 1,721,121 |  |  |  | 1,356,511 |  |  |  | 1,721,121 |  |  |  | 1,356,511 |
Unvested restricted stock units |  |  | 90,000 |  |  |  |  |  |  |  | 90,000 |  |  |  |  |
Shares subject to warrants to purchase convertible preferred stock |  |  |  |  |  |  | 156,294 |  |  |  | — |  |  |  | 156,294 |
Shares subject to warrants to purchase common stock |  |  | 956 |  |  |  | — |  |  |  | 956 |  |  |  | — |
Shares subject to term debt optional conversion into convertible preferred stock |  |  | — |  |  |  | 1,457,437 |  |  |  | — |  |  |  | 1,457,437 |
Shares subject to term debt optional conversion into common stock |  |  | 1,099,317 |  |  |  | — |  |  |  | 1,099,317 |  |  |  | — |
Total |  |  | 2,911,394 |  |  |  | 15,187,701 |  |  |  | 2,911,394 |  |  |  | 15,187,701 |

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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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