Convertible Preferred Stock - Summary of Convertible Preferred Stock Outstanding (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		1 Months Ended
	Mar. 09, 2021	Jan. 31, 2021
Convertible Preferred Stock [Line Items]
Shares authorized (in shares)	361,744
Shares outstanding (in shares)	349,124
Aggregate Liquidation Preference	$ 870,654
Carrying Value of Preferred	$ 879,113
A
Convertible Preferred Stock [Line Items]
Shares authorized (in shares)	28,000
Shares outstanding (in shares)	16,358
Per share price at issuance (in dollars per share)	$ 0.02
Per share conversion price (in dollars per share)	$ 0.02
Aggregate Liquidation Preference	$ 327
Carrying Value of Preferred	$ 313
B
Convertible Preferred Stock [Line Items]
Shares authorized (in shares)	45,532
Shares outstanding (in shares)	45,532
Per share price at issuance (in dollars per share)	$ 0.03
Per share conversion price (in dollars per share)	$ 0.03
Aggregate Liquidation Preference	$ 1,070
Carrying Value of Preferred	$ 1,054
C
Convertible Preferred Stock [Line Items]
Shares authorized (in shares)	95,290
Shares outstanding (in shares)	95,290
Per share price at issuance (in dollars per share)	$ 0.03
Per share conversion price (in dollars per share)	$ 0.03
Aggregate Liquidation Preference	$ 2,935
Carrying Value of Preferred	$ 4,150
D
Convertible Preferred Stock [Line Items]
Shares authorized (in shares)	54,860
Shares outstanding (in shares)	54,215
Per share price at issuance (in dollars per share)	$ 0.04
Per share conversion price (in dollars per share)	$ 0.04
Aggregate Liquidation Preference	$ 2,150
Carrying Value of Preferred	$ 2,097
D-1
Convertible Preferred Stock [Line Items]
Shares authorized (in shares)	44,706
Shares outstanding (in shares)	44,706
Per share price at issuance (in dollars per share)	$ 0.09
Per share conversion price (in dollars per share)	$ 0.09
Aggregate Liquidation Preference	$ 4,172
Carrying Value of Preferred	$ 12,998
E
Convertible Preferred Stock [Line Items]
Shares authorized (in shares)	24,340
Shares outstanding (in shares)	24,340
Per share price at issuance (in dollars per share)	$ 1.03
Per share conversion price (in dollars per share)	$ 1.03
Aggregate Liquidation Preference	$ 25,000
Carrying Value of Preferred	$ 24,906
F
Convertible Preferred Stock [Line Items]
Shares authorized (in shares)	33,149
Shares outstanding (in shares)	33,149
Per share price at issuance (in dollars per share)	$ 4.53
Per share conversion price (in dollars per share)	$ 4.53
Aggregate Liquidation Preference	$ 150,000
Carrying Value of Preferred	$ 149,640
Series G Preferred Stock
Convertible Preferred Stock [Line Items]
Shares authorized (in shares)	23,645
Shares outstanding (in shares)	23,645
Per share price at issuance (in dollars per share)	$ 6.34
Per share conversion price (in dollars per share)	$ 6.34
Aggregate Liquidation Preference	$ 150,000
Carrying Value of Preferred	$ 149,669
H
Convertible Preferred Stock [Line Items]
Shares authorized (in shares)	12,222
Shares outstanding (in shares)	11,889
Per share price at issuance (in dollars per share)	$ 45.0	$ 45.00
Per share conversion price (in dollars per share)	$ 45.0
Aggregate Liquidation Preference	$ 535,000
Carrying Value of Preferred	$ 534,286