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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of vesting of award under share-based payment arrangement.

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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