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Net Loss per Share (Tables) | 9 Months Ended
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Sep. 30, 2021
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 September 30, |  | Nine Months Ended September 30,
(in thousands, except per share data) | 2021 |  | 2020 |  | 2021 |  | 2020
Numerator: |  |  |  |  |  |  |
Net loss | $ | (20,175) |  |  | $ | (17,449) |  |  | $ | (58,489) |  |  | $ | (43,731) |
Deemed dividend as a result of Class B warrant price reset (Note 10) | — |  |  | — |  |  | (8,239) |  |  | — |
Net loss attributable to common stockholders | $ | (20,175) |  |  | $ | (17,449) |  |  | $ | (66,728) |  |  | $ | (43,731) |
Denominator: |  |  |  |  |  |  |
Weighted average shares of common stock outstanding—basic and diluted | 26,609 |  |  | 20,085 |  |  | 24,667 |  |  | 20,035 |
Net loss per share attributable to common stockholders— basic and diluted | $ | (0.76) |  |  | $ | (0.87) |  |  | $ | (2.71) |  |  | $ | (2.18) |
Schedule of Anti-dilutive Securities Excluded from Computation of Diluted Net Loss per Share Attributable to Common Stockholders | The Company excluded the following potential shares of common stock, presented based on amounts outstanding at each period end, 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 September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Options to purchase shares of common stock | 1,952,891 |  |  | 1,613,024 |  |  | 1,952,891 |  |  | 1,613,024 |
Unvested restricted stock units | 906,873 |  |  | 611,994 |  |  | 906,873 |  |  | 611,994 |
Warrants to purchase shares of common stock (excluding prefunded warrants, which are included in basic shares outstanding) | 9,449,128 |  |  | 9,626,040 |  |  | 9,449,128 |  |  | 9,626,040 |
| 12,308,892 |  |  | 11,851,058 |  |  | 12,308,892 |  |  | 11,851,058 |

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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