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Stock-Based Compensation Expense - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | May 31, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Issuance of common stock under the employee stock purchase plan |  | $ 923,000 |  | $ 873,000 | $ 740,000 |  |
Common Stock |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Issuance of common stock under the employee stock purchase plan |  | $ 3,000 |  | $ 3,000 | $ 2,000 |  |
Issuance of common stock under the employee stock purchase plan (in shares) |  | 266,000 |  | 298,000 | 233,000 |  |
ESPP |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Equity incentive plan, number of shares available for grant increased by shares |  |  |  |  |  |  | 3,000,000
Common stock available for issuance | 3,100,000 |  |  |  |  | 3,100,000 |
Employees Awards |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Issuance of common stock under the employee stock purchase plan |  |  |  |  |  | $ 25,000 |
Issuance of common stock under the employee stock purchase plan (in shares) |  |  |  |  |  | 5,000 |
Employees Awards | ESPP |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Discount on purchase price percentage of fair market value |  |  |  |  |  | 85.00% |
Options and PNQs |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation expense, weighted average period for recognition |  |  |  |  |  | 5 months 1 day |
RSUs |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock units weighted average grant date fair value |  | $ 4.56 | $ 4.16 |  |  |  |
Unrecognized compensation expense, weighted average period for recognition |  |  |  |  |  | 2 years 6 months 21 days |
Unrecognized compensation expense related to non-option | $ 21,100,000 |  |  |  |  | $ 21,100,000 |
RSUs | Employees Awards |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock units weighted average grant date fair value | $ 5.27 |  |  |  |  |  |
RSUs | Employees Awards | Share-Based Payment Arrangement, Tranche One |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period | 3 years | 4 years | 3 years |  |  |  |
Restricted stock units grant date fair value | 28,820 | 2,598,971 | 91,900 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 25.00% |  |  |  |  |
RSUs | Employees Awards | Share-Based Payment Arrangement, Tranche Two |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period | 4 years | 3 years | 2 years |  |  |  |
Restricted stock units grant date fair value | 7,565 | 61,750 | 42,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 25.00% |  |  |  |  |  |
RSUs | Employees Awards | Share-Based Payment Arrangement, Tranche Three |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |  |
Restricted stock units grant date fair value |  |  | 46,005 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 25.00% |  |  |  |
Market RSU's |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation expense, weighted average period for recognition |  |  |  |  |  | 1 year 9 months 29 days |
Unrecognized compensation expense related to non-option | $ 17,400,000 |  |  |  |  | $ 17,400,000 |
Market RSU's | Employees Awards |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock units weighted average grant date fair value |  | $ 9.4 |  |  |  |  |
Market RSU's | Employees Awards | Share-Based Payment Arrangement, Tranche One |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 0.00% |  |  |  |  |
Market RSU's | Employees Awards | Share-Based Payment Arrangement, Tranche Two |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 50.00% |  |  |  |  |
Market RSU's | Employees Awards | Share-Based Payment Arrangement, Tranche Three |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 100.00% |  |  |  |  |
2018 Equity Incentive Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Equity incentive plan, number of shares available for grant increased by shares |  |  |  |  |  |  | 25,000,000

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