Stock-Based Compensation - Additional Information (Details) - USD ($)			1 Months Ended	12 Months Ended
	Jan. 01, 2023	Jan. 01, 2019	Mar. 31, 2018	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jan. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Intrinsic value of shares exercised				$ 26,000,000	$ 17,000,000	$ 7,000,000
Fair value of shares vested				$ 48,000,000	$ 40,000,000	17,000,000
Common stock, shares outstanding				72,900,000	70,800,000
Description of expected term simplified method				opted to use the “simplified method” for estimating the expected term of options, whereby the expected term equals the arithmetic average of the vesting term and the original contractual term of the option (generally 10 years).
Expected term				10 years
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation costs related to non-vested awards other than options				$ 37,000,000
Total grant date fair value of shares vested				$ 15,000,000	$ 12,000,000	$ 100,000
Non-vested stock option recognized weighted average period				2 years 4 months 24 days
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation costs related to non-vested stock option awards				$ 90,000,000
Non-vested stock option recognized weighted average period				2 years 2 months 12 days
Expected term				6 years 7 days	6 years 7 days	6 years 7 days
Awards expiration period				10 years
2015 Stock Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shares of authorized common stock reserved for future issuance			700,000
2018 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares issued or transferred			3,600,000
Total shares of authorized common stock reserved for future issuance				3,600,000
2018 Equity Incentive Plan | Subsequent Event
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares of common stock reserved for issuance under evergreen provision	2,900,000
2018 Equity Incentive Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares of common stock reserved for issuance under evergreen provision		3,600,000
Percentage of common stock outstanding		4.00%
2020 Inducement Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares issued or transferred					5,000,000.0	1,000,000.0	3,000,000.0
Total shares of authorized common stock reserved for future issuance				3,200,000
2018 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shares of authorized common stock reserved for future issuance				2,000,000.0
Shares issued				300,000	200,000	200,000
Purchase date of fair market value trading days			24 months
Shares reserved for future issuance			700,000
2018 Employee Stock Purchase Plan | Subsequent Event
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares of common stock reserved for issuance under evergreen provision	700,000
2018 Employee Stock Purchase Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Purchase price of common stock as percentage of market value			85.00%
Number of shares purchased on each purchase date			3,000
Number of shares purchased in a calendar year			$ 25,000
Percentage of common stock shares outstanding		1.00%
Common stock, shares outstanding		1,100,000