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Stockholders' Equity (Stock-Based Awards) - Additional Information (Detail) - shares |  |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 01, 2021 | Jan. 01, 2020 | Apr. 30, 2019 | Jun. 30, 2021 | Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common stock, capital shares reserved for future issuance |  |  |  | 4,564,406 | 3,646,200
Share based compensation options to purchase no of common stock |  |  |  | 3,202,377 | 2,171,477
Share based compensation options grants in the period |  |  |  | 1,363,875 |
2019 Stock Incentive Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share based compensation, award description |  |  |  | The total number of shares of common stock that may be issued under the 2019 Plan and the 2012 Plan was 4,060,617 as of June 30, 2021, of which 858,240 shares remained available for grant under the 2019 Plan. Awards may be made under the 2019 Plan for up to such number of shares of the Company’s common stock as is equal to the sum of i) 1,578,947 shares; plus ii) the number of shares (up to 1,157,894 shares) equal to the number of shares of the Company’s common stock subject to outstanding awards under the 2012 Stock Incentive Plan (the “2012 Plan”) that expire, terminate or are otherwise cancelled, forfeited or repurchased by the Company at their original issuance price pursuant to a contractual repurchase right; plus iii) an annual increase to be added on the first day of each fiscal year, beginning with 2020 and continuing through 2029, equal to the lesser of (a) 2,105,623 shares of common stock, (b) 4% of the number of outstanding shares of the Company’s common stock on such date and (c) an amount determined by the Company’s board of directors. |
Number of shares available for grant |  |  |  | 858,240 |
Common stock, capital shares reserved for future issuance | 741,871 | 713,383 |  | 1,578,947 |
Share based compensation grant period |  |  |  | 10 years |
Share based compensation vesting description |  |  |  | Options granted under the 2019 Plan and the 2012 Plan have a maximum term of ten years. Options granted to employees, officers and non-employees generally vest over four years based on varying vesting schedules that primarily include: 25% vesting on the first anniversary date of grant and the balance ratably over the next 36 months or vesting in equal monthly or quarterly installments over four years. |
Share based compensation options to purchase no of common stock |  |  |  | 2,316,959 | 1,249,653
2019 Stock Incentive Plan [Member] | Employees, Officers and Non-employee Consultants [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share based compensation vesting period |  |  |  | 4 years |
2019 Stock Incentive Plan [Member] | Employees, Officers and Non-employee Consultants [Member] | Vesting First Anniversary Date of Grant [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share based compensation vesting Percentage |  |  |  | 25.00% |
2019 Stock Incentive Plan [Member] | Director [Member] | Minimum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share based compensation vesting period |  |  |  | 1 year |
2019 Stock Incentive Plan [Member] | Director [Member] | Maximum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share based compensation vesting period |  |  |  | 2 years |
2019 Stock Incentive Plan [Member] | Common Stock [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Increase in additional number of shares to be issued |  | 2,105,623 |  |  |
Percentage of number of common stock, shares outstanding | 4.00% | 4.00% |  |  |
2019 Plan and 2012 Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Total number of common shares authorized under the plan |  |  |  | 4,060,617 |
2012 Stock Incentive Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share based compensation grant period |  |  |  | 10 years |
Share based compensation vesting description |  |  |  | Options granted under the 2019 Plan and the 2012 Plan have a maximum term of ten years. Options granted to employees, officers and non-employees generally vest over four years based on varying vesting schedules that primarily include: 25% vesting on the first anniversary date of grant and the balance ratably over the next 36 months or vesting in equal monthly or quarterly installments over four years. |
Share based compensation options to purchase no of common stock |  |  |  | 885,418 | 921,824
2012 Stock Incentive Plan [Member] | Stock Option [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share based compensation options grants in the period |  |  |  | 0 |
2012 Stock Incentive Plan [Member] | Other Equity-Based Award [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share based compensation options grants in the period |  |  |  | 0 |
2012 Stock Incentive Plan [Member] | Employees, Officers and Non-employee Consultants [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share based compensation vesting period |  |  |  | 4 years |
2012 Stock Incentive Plan [Member] | Employees, Officers and Non-employee Consultants [Member] | Vesting First Anniversary Date of Grant [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share based compensation vesting Percentage |  |  |  | 25.00% |
2012 Stock Incentive Plan [Member] | Director [Member] | Minimum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share based compensation vesting period |  |  |  | 1 year |
2012 Stock Incentive Plan [Member] | Director [Member] | Maximum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share based compensation vesting period |  |  |  | 2 years |
2012 Stock Incentive Plan [Member] | Common Stock [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share based compensation options to purchase number of shares outstanding |  |  |  | 1,157,894 |
2019 Employee Stock Purchase Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share based compensation, award description |  |  |  | The total number of shares of common stock that may be issued under the 2019 ESPP Plan was 518,918 as of June 30, 2021, of which 503,789 shares remain available for issuance. The number of shares of the Company’s common stock that have been approved to be issued under the 2019 ESPP is equal to the sum of i) 155,106 shares plus ii) an annual increase to be added on the first day of each fiscal year, beginning with the fiscal year ending December 31, 2020 and continuing for each fiscal year until and including, the fiscal year ending December 31, 2029, equal to the least of (a) 526,315 shares of common stock, (b) 1% of the number of outstanding shares of the Company’s common stock on such date and (c) an amount determined by the Company’s board of directors. Effective January 1, 2021 and January 1, 2020, respectively, the aggregate number of shares of the Company’s common stock that may be issued under the 2019 ESPP increased, pursuant to the terms of the 2019 ESPP, by an additional 185,467 shares and 178,345 shares, equal to 1% of the Company’s then-outstanding common stock |
Total number of common shares authorized under the plan |  |  |  | 518,918 |
Number of shares available for grant |  |  |  | 503,789 |
Common stock, capital shares reserved for future issuance |  |  | 155,106 |  |
2019 Employee Stock Purchase Plan [Member] | Common Stock [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Increase in additional number of shares to be issued | 185,467 | 178,345 | 526,315 |  |
Percentage of number of common stock, shares outstanding | 1.00% | 1.00% | 1.00% |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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