Stockholders' Equity - Additional Information (Detail)							1 Months Ended		3 Months Ended		8 Months Ended	12 Months Ended				15 Months Ended	24 Months Ended
	Mar. 31, 2022 $ / shares shares	Mar. 18, 2022 USD ($)	Jul. 28, 2021 USD ($)	Mar. 17, 2020 USD ($)	Sep. 28, 2017 USD ($) shares	Apr. 13, 2016 shares	May 31, 2015 USD ($) $ / shares shares	Feb. 28, 2014 Tranche $ / shares shares	Mar. 31, 2022 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) shares	Mar. 31, 2022 $ / shares shares	Dec. 31, 2021 $ / shares shares	Dec. 31, 2020 shares	Dec. 31, 2019 shares	Dec. 31, 2018 shares	Dec. 31, 2016 USD ($)	Mar. 17, 2022 shares	Feb. 20, 2014 USD ($)
Equity [Line Items]
Preferred stock, shares authorized	10,000,000								10,000,000		10,000,000	10,000,000
Preferred stock, par value | $ / shares	$ 0.00001								$ 0.00001		$ 0.00001	$ 0.00001
Preferred stock, shares outstanding	0								0		0	0
Common stock, shares authorized	300,000,000								300,000,000		300,000,000	300,000,000
Common stock, par value | $ / shares	$ 0.00001								$ 0.00001		$ 0.00001	$ 0.00001
Number of common stock for issuance in exchange for future services from founders								1,000,000
Common stock price per share | $ / shares								$ 0.01
Number of tranches | Tranche								2
Unrecognized compensation expense | $							$ 62,000											$ 168,000
Common stock shares repurchased							633,810
Repurchase of common stock from stockholders, per share | $ / shares							$ 0.00001
Remaining number of repurchased shares							366,190
Common stock sold						7,500,000			0			0	0	0	0
Shares issued under ESPP									0	0
ATM Agreement [Member]
Equity [Line Items]
Shelf registration statement expiry date			Aug. 11, 2021
2021 Shelf Registration Statement [Member]
Equity [Line Items]
Maximum amount of Securities that can be offered | $			$ 600,000,000.0
Common Stock [Member]
Equity [Line Items]
Repurchase of common stock (in shares)									1,464,217
Common Stock [Member] | ATM Agreement [Member]
Equity [Line Items]
Common stock sold											0
Repurchase Program [Member]
Equity [Line Items]
Repurchase of common stock (in shares)																	1,464,217
Stock repurchase program, additional maturity period				2 years
New Repurchase Program [Member]
Equity [Line Items]
Repurchase of common stock (in shares)	0
Stock repurchase program, additional maturity period		2 years
Maximum [Member] | Common Stock [Member] | ATM Agreement [Member]
Equity [Line Items]
Aggregate offering price, common stock | $			$ 125,000,000.0
Maximum [Member] | Repurchase Program [Member]
Equity [Line Items]
Purchase of common stock and warrants | $				$ 50,000,000.0
Maximum [Member] | New Repurchase Program [Member]
Equity [Line Items]
Purchase of common stock and warrants | $		$ 50,000,000.0
LPC [Member] | Commitment Purchase Agreement [Member] | Common Stock [Member] | Registration Rights Agreement [Member]
Equity [Line Items]
Common stock purchase agreement term					30 months
Common stock issued as consideration for commitment					100,000
Gross proceeds from common stock issuance | $					$ 802,000
Common stock sold					343,051
LPC [Member] | Maximum [Member] | Commitment Purchase Agreement [Member] | Common Stock [Member] | Registration Rights Agreement [Member]
Equity [Line Items]
Total of purchase agreement and potential aggregate future purchases | $					$ 15,000,000.0
Common stock to be sold, subject to certain limitations					75,000
Total purchase proceeds per purchase date, subject to certain limitations | $					$ 1,000,000.0
LPC [Member] | Minimum [Member] | Commitment Purchase Agreement [Member] | Common Stock [Member] | Registration Rights Agreement [Member]
Equity [Line Items]
Percentage of shares may not sell if it is beneficial owning					4.99%
Tranche One [Member]
Equity [Line Items]
Number of common stock for issuance in exchange for future services from founders								500,000
Remaining number of repurchased shares							183,095
Stock compensation expense | $									$ 0	$ 0						$ 31,000
Tranche Two [Member]
Equity [Line Items]
Number of common stock for issuance in exchange for future services from founders								500,000
Remaining number of repurchased shares							183,095