Stockholders' Equity - Narrative (Detail) - USD ($)			3 Months Ended		12 Months Ended
	Jan. 01, 2022	Feb. 16, 2021	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2021
Class of Stock [Line Items]
Common stock, shares authorized (in shares)			1,000,000,000			1,000,000,000
Common stock, par value (in dollars per share)			$ 0.0001			$ 0.0001
Preferred stock, shares authorized (in shares)			10,000,000			10,000,000
Common stock, voting rights			one
Common stock, shares outstanding (in shares)			141,418,989			141,301,569
Sponsor vesting shares outstanding (in shares)			4,500,000			4,500,000
Stock options available for grant (in shares)			20,070,574			7,667,247
Stock options, exercisable (in shares)			4,231,608			4,130,184
Stock option, aggregate intrinsic value			$ 49,700,000
Cost not yet recognized			7,000,000
Stock-based compensation			$ 918,000	$ 627,000
Common Stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares)			1,010,000,000
Common stock, par value (in dollars per share)			$ 0.0001
Warrants issued (in shares)			1,000,000,000
Common stock, shares outstanding (in shares)			141,418,989			141,418,989
General and administrative expense
Class of Stock [Line Items]
Stock-based compensation			$ 700,000	500,000
Research and development expense
Class of Stock [Line Items]
Stock-based compensation			$ 200,000	100,000
Performance and market based awards
Class of Stock [Line Items]
Stock options issued during the period (in shares)					2,920,732
Stock options, vested (in shares)		529,119
Stock-based compensation				$ 2,900,000
Performance and market based awards | First vesting
Class of Stock [Line Items]
Stock option plan, vesting percentage				2.0833%
Stock options, outstanding (in shares)				529,119
Performance and market based awards | Second vesting
Class of Stock [Line Items]
Stock options, outstanding (in shares)				2,391,613
Options to purchase common stock
Class of Stock [Line Items]
Stock compensation not yet recognized, vesting period			2 years 3 months 18 days
Stock options issued during the period (in shares)			0
Employee Stock Purchase Plan | Employee Stock
Class of Stock [Line Items]
Purchase price of common stock			85.00%
Number of shares authorized (in shares)			3,722,490			1,846,710
Evergreen shares reserve feature period			10 years
Increase in shares authorized			1.00%
Increase in number of shares of authorized common stock (in shares)			3,693,420
Number of additional shares authorized (in shares)	1,875,780
Stock Plans
Class of Stock [Line Items]
Stock option plan, exercisable period			4 years
Stock Plans | Employee Stock
Class of Stock [Line Items]
Common stock, shares reserved (in shares)			27,846,011
Stock Plans | RSU
Class of Stock [Line Items]
Option vesting period			3 years
Requisite service period			3 years
Stock Plans | RSU | Tranche one
Class of Stock [Line Items]
Stock option plan, vesting percentage			33.30%
Stock Plans | RSU | Tranche two
Class of Stock [Line Items]
Stock option plan, vesting percentage			33.30%
Stock Plans | RSU | Tranche three
Class of Stock [Line Items]
Stock option plan, vesting percentage			33.30%
Stock Plans | Performance shares | Minimum
Class of Stock [Line Items]
Stock option plan, vesting percentage			0.00%
Stock Plans | Performance shares | Maximum
Class of Stock [Line Items]
Stock option plan, vesting percentage			300.00%
Stock Plans | Share-based payment arrangement, nonemployee
Class of Stock [Line Items]
Stock option plan, exercisable period			10 years
Stock Plans | One year from the vesting commencement date
Class of Stock [Line Items]
Stock option plan, vesting percentage			25.00%
Option vesting period			1 year
Stock Plans | More than one year from vesting commencement date
Class of Stock [Line Items]
Stock option plan, vesting percentage			2.778%
2021 Equity Incentive Plan | Employee Stock
Class of Stock [Line Items]
Number of shares authorized (in shares)						18,467,109
Evergreen shares reserve feature period			10 years
Increase in shares authorized			5.00%
Number of additional shares authorized (in shares)	9,378,902
Maximum percentage of share reserve, outstanding diluted stock			15.00%
2021 Equity Incentive Plan | RSU
Class of Stock [Line Items]
Stock compensation not yet recognized, vesting period			3 years
Vested (in shares)			0
Outstanding (in shares)				0
Cost not yet recognized, excluding options			$ 6,000,000
2021 Equity Incentive Plan | Performance shares
Class of Stock [Line Items]
Share-based payment arrangement expense			$ 0
Vested (in shares)			0
Outstanding (in shares)				0
Stock compensation not yet recognized			$ 17,700,000