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Equity Plans and Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	May 31, 2022	Jun. 30, 2021	Jan. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Increase in aggregate number of shares of common stock authorized for issuance						15,000,000
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options vesting period			7 years
Performance Based Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock units awards outstanding	557,000		557,000		193,000
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock units awards outstanding	4,227,000		4,227,000		3,479,000
Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation expense related to restricted stock	$ 0.7	$ 0.2	$ 1.1	$ 0.4
Maximum | Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expiration period			10 years
Minimum | Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expiration period			7 years
2018 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Newly reserved shares of common stock	9,838,318		9,838,318				3,250,000	1,500,000
2014 Employee Stock Purchase Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued to employees						32,600,000
Performance Based Vesting Schedule | Performance Based Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock units awards outstanding	36,000		36,000

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