Organization and Background - Additional Information (Detail) - USD ($)		3 Months Ended			9 Months Ended
	Jun. 14, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2020	Sep. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Product Information [Line Items]
Proceeds from initial public offering					$ 126,538,000
Other offering costs and reimbursements	$ 6,200,000
Preferred stock, shares authorized		200,000,000			200,000,000
Preferred stock par value		$ 0.001			$ 0.001
Common Class A [Member]
Product Information [Line Items]
Stock issued during the period shares			14,773,939
Common stock, shares authorized		3,750,000,000			3,750,000,000
Common stock, par or stated value per share		$ 0.001			$ 0.001
Common stock, shares outstanding	152,270,401	155,022,167			155,022,167
Stock issued during period, shares conversion of units					73,813,713
Share issued in exercise of warrants		8,360,331			8,360,331
Shares repurchased (in shares)		37,679	4,138,866
Common Class A [Member] | Co-Founder and Chief Executive Officer [Member]
Product Information [Line Items]
Shares issued in connection with an agreement (in shares)					39,463,787
Common Class B [Member]
Product Information [Line Items]
Common stock, shares authorized		50,000,000			50,000,000
Common stock, par or stated value per share		$ 0.001			$ 0.001
Common stock, shares outstanding		37,856,095			37,856,095	37,856,095
Shares repurchased (in shares)		0	2,307,692		2,307,692
Convertible Preferred Stock [Member]
Product Information [Line Items]
Preferred stock, shares outstanding		39,223,194			39,223,194
Series A Common Stock [Member]
Product Information [Line Items]
Common stock, shares authorized							204,220,800
Common stock, par or stated value per share							$ 0.001
Common stock, shares outstanding							112,012,693
Shares issued in connection with an agreement (in shares)				154,560
Reclassification of temporary to permanent equity					26,722,208
Series B Common Stock [Member]
Product Information [Line Items]
Common stock, shares authorized							3,400,000
Common stock, par or stated value per share							$ 0.001
Common stock, shares outstanding							3,054,318
Reclassification of temporary to permanent equity					3,054,318
Restricted Series A Common Stock [Member]
Product Information [Line Items]
Shares repurchased (in shares)					4,138,866
Shares issued in connection with an agreement (in shares)					4,138,866
Reclassification of temporary to permanent equity					70,108,628
Restricted Series B Common Stock [Member]
Product Information [Line Items]
Shares issued in connection with an agreement (in shares)					540,000
Restricted Stock [Member] | Tax Withholding Repurchase [Member]
Product Information [Line Items]
Stock redeemed or called during period, shares					92,671
Restricted Stock [Member] | Tax Withholding Repurchase [Member] | Common Class A [Member]
Product Information [Line Items]
Stock repurchase program, number of shares authorized to be repurchased		1,799,650			1,799,650
Restricted Stock [Member] | Tax Withholding Repurchase [Member] | Common Class B [Member]
Product Information [Line Items]
Stock repurchase program, number of shares authorized to be repurchased		197,490			197,490
Restricted Stock [Member] | Class A Stock Repurchase [Member] | Common Class A [Member]
Product Information [Line Items]
Stock repurchase program, number of shares authorized to be repurchased		2,158,027			2,158,027
Stock redeemed or called during period, shares					88,518
Restricted Stock [Member] | Class B Stock Repurchase [Member] | Common Class B [Member]
Product Information [Line Items]
Stock repurchase program, number of shares authorized to be repurchased		1,767,692			1,767,692
Stock redeemed or called during period, shares					342,510
IPO [Member]
Product Information [Line Items]
Stock issued during the period shares	14,773,939
Sale of stock issue price per share	$ 10
Proceeds from initial public offering	$ 132,700,000
IPO [Member] | Restricted Series A Common Stock [Member]
Product Information [Line Items]
Shares Vested					8,734,893