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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2021
Stockholders Equity Note [Abstract] |
Schedule of Common Stock Reserved for Future Issuance | As of June 30, 2021 and December 31, 2020, the Company had reserved shares of common stock for the exercise of outstanding stock options and shares of common stock remaining available for future stock-based awards under the Company’s 2012 Stock Incentive Plan, 2019 Stock Incentive Plan and 2019 Employee Stock Purchase Plan, as shown in the table below:
|  | June 30, 2021 |  |  | December 31, 2020 |
Shares of common stock reserved for future issuance under the 2012 Stock Incentive Plan |  |  | 885,418 |  |  |  | 921,824 |
Shares of common stock reserved for future issuance under the 2019 Stock Incentive Plan |  |  | 3,175,199 |  |  |  | 2,396,922 |
Shares of common stock reserved for future issuance under the 2019 Employee Stock Purchase Plan |  |  | 503,789 |  |  |  | 327,454 |
|  |  | 4,564,406 |  |  |  | 3,646,200 |
Schedule of Share-based Compensation, Stock Options, Activity | A summary of the Company’s combined stock option activity for the 2019 Plan and the 2012 Plan for the six months ended June 30, 2021 is as follows:
|  | Number of Option Shares |  |  | Weighted Average Exercise Price |
Outstanding as of December 31, 2020 |  |  | 2,171,477 |  |  | $ | 5.62 |
Granted |  |  | 1,363,875 |  |  | $ | 3.02 |
Forfeited |  |  | (331,824 | ) |  | $ | 4.57 |
Expired |  |  | (1,151 | ) |  | $ | 10.00 |
Exercised |  |  | — |  |  | $ | — |
Outstanding as of June 30, 2021 |  |  | 3,202,377 |  |  | $ | 4.62 |
Options exercisable as of June 30, 2021 |  |  | 1,393,630 |  |  | $ | 5.12 |
Options unvested as of June 30, 2021 |  |  | 1,808,747 |  |  | $ | 4.24 |
Schedule of Stock-based Compensation Expenses Recognized | The following table summarizes the classifications of stock-based compensation expenses for the 2012 Plan, the 2019 Plan and the 2019 ESPP recognized in the Condensed Consolidated Statements of Operations:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Research and development expense |  | $ | 251 |  |  | $ | 84 |  |  | $ | 424 |  |  | $ | 177 |
General and administrative expense |  |  | 494 |  |  |  | 505 |  |  |  | 1,039 |  |  |  | 1,142 |
|  | $ | 745 |  |  | $ | 589 |  |  | $ | 1,463 |  |  | $ | 1,319 |

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