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Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Summary of Stock Option Activity with in 2014 Stock Incentive Plan and 2019 Incentive Award Plan | The below summary includes stock option activity within the Company’s 2014 Stock Incentive Plan and 2019 Incentive Award Plan for the nine months ended September 30, 2023:
|  | Number of shares |  |  | Weighted average exercise |  |  | Weighted average remaining contractual term |  |  | Aggregate intrinsic |
|  | in Plans |  |  | price |  |  | (in years) |  |  | value |
Outstanding as of December 31, 2022 |  |  | 5,742,053 |  |  | $ | 2.35 |  |  |  | 6.69 |  |  | $ | 9,114 |
Granted |  |  | 27,350 |  |  |  | 4.66 |  |  |  | 4.66 |  |  |  | — |
Exercised |  |  | (2,969 | ) |  |  | 0.07 |  |  |  | — |  |  | $ | 1 |
Forfeited |  |  | (1,103,713 | ) |  |  | 2.45 |  |  |  | — |  |  |  | — |
Outstanding as of September 30, 2023 |  |  | 4,662,721 |  |  | $ | 2.34 |  |  |  | 6.20 |  |  | $ | 3 |
Options exercisable as of September 30, 2023 |  |  | 4,324,933 |  |  | $ | 2.35 |  |  |  | 5.92 |  |  | $ | 3 |
Options unvested as of September 30, 2023 |  |  | 337,788 |  |  | $ | 2.23 |  |  |  | 7.28 |  |  | $ | — |
Summary of Grant-date Fair Value of Stock Options Granted on Weighted Average Basis | The assumptions that the Company used to determine the grant-date fair value of stock options granted to employees and directors were as follows, presented on a weighted average basis:
|  | September 30, |
|  | 2023 |
Risk-free interest rate |  |  | 3.6 | %
Expected term (in years) |  |  | 6.0 |
Expected volatility |  |  | 92.0 | %
Expected dividend yield |  |  | 0.0 | %
Summary of Recognized Stock-based Compensation | The Company recognized stock-based compensation within the accompanying consolidated statements of operations as follows:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Research and development |  | $ | 750 |  |  | $ | 2,095 |  |  | $ | 1,760 |  |  | $ | 5,994 |
General and administrative |  |  | 2,175 |  |  |  | 3,500 |  |  |  | 7,493 |  |  |  | 9,431 |
Total |  | $ | 2,925 |  |  | $ | 5,595 |  |  | $ | 9,253 |  |  | $ | 15,425 |
Restricted Stock Units |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Summary of Status of Restricted Common Stock and Restricted Stock Units | The below summary includes restricted stock unit activity within the Company's 2019 Incentive Award Plan for the nine months ended September 30, 2023:
|  | Number of shares |  |  | Weighted average fair value |
Unvested, December 31, 2022 |  |  | 3,101,650 |  |  | $ | 2.51 |
Awarded |  |  | 1,666,340 |  |  |  | 4.78 |
Vested |  |  | (1,630,150 | ) |  |  | 2.91 |
Forfeited |  |  | (1,207,690 | ) |  |  | 3.58 |
Unvested as of September 30, 2023 |  |  | 1,930,150 |  |  | $ | 3.47 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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