Stock-Based Compensation - Additional Information (Details) - USD ($)		1 Months Ended		3 Months Ended			6 Months Ended
	May 14, 2024	Aug. 31, 2021	Apr. 30, 2021	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment arrangement, expense				$ 3,284,000		$ 3,276,000	$ 6,565,000	$ 6,956,000
Unrecognized Compensation Expense Period							2 years 2 months 12 days
Common stock, authorized				500,000,000			500,000,000		500,000,000
Number of Options, Granted				0		0	2,527,000	3,070,000
Outstanding Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment arrangement, expense				$ 674,000		$ 369,000	$ 1,366,000	$ 800,000
Vesting of RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment arrangement, expense				2,576,000		2,875,000	5,142,000	5,992,000
Unrecognized compensation expense				15,416,000			15,416,000
General and Administrative Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment arrangement, expense				1,874,000		1,929,000	3,765,000	$ 4,144,000
Zenith
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options, Granted								844,000
Zenith | General and Administrative Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment arrangement, expense				0		0	0	$ 109,000
RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment arrangement, expense							0
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense				$ 8,224,000			$ 8,224,000
Unrecognized Compensation Expense Period							3 years 2 months 12 days
2018 Stock Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation arrangement vesting period							4 years
Amended 2018 Stock Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options, Granted			0
Amended 2018 Stock Plan | RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation arrangement vesting period			4 years
Share-based compensation arrangement, options granted			1,533,000
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value			$ 21.55
Share-based payment arrangement, expense			$ 33,033,000
2021 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Annual additions to the plan				8,900,000
2021 Equity Incentive Plan | Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, authorized				15,500,000			15,500,000
Annual additions to the plan	8,900,000
2021 Equity Incentive Plan | RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation arrangement vesting period		4 years
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment arrangement, expense				$ 34,000		$ 32,000	$ 57,000	$ 55,000
Annual additions to the plan					2,000,000
Number of shares available for sale				7,268,000	7,268,000		7,268,000		5,402,000
Employee Stock Purchase Plan | Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation by share based arrangement, quoted market price on purchase date							85.00%
Shares reserved for future issuance				2,000,000			2,000,000
Percentage of shares reserved for future issuance							1.00%
Minimum | 2021 Equity Incentive Plan | RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation arrangement vesting period		1 year
Maximum | 2018 Stock Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation by share based arrangement term							10 years
Maximum | 2021 Equity Incentive Plan | Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for sale	24,400,000
Maximum | 2021 Equity Incentive Plan | RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation arrangement vesting period		3 years
Maximum | Employee Stock Purchase Plan | Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved for future issuance										2,000,000