Redeemable Noncontrolling Interest - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions				9 Months Ended	12 Months Ended
	Dec. 14, 2020	Oct. 02, 2020	Apr. 01, 2020	Sep. 30, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Cumulative Dividends In Arrears On Preferred Stock				$ 1.5	$ 0.7
Five Points Capital
Class of Stock [Line Items]
Issuance price			$ 1.0
TrueBridge Capital
Class of Stock [Line Items]
Issuance price	$ 1.0
TrueBridge Capital | Series B Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Issuance price		$ 4.0
Option to purchase of preferred stock, shares		1,333,333
Shares issued, price per share		$ 3.00
TrueBridge Capital | Series D Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Shares issued	285,714	28,590,910
Shares price	$ 3.50	$ 3.30
Issuance price		$ 94.4
Enhanced | Series B Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Issuance price	$ 10.0
Option to purchase of preferred stock, shares	3,333,334
Shares issued, price per share	$ 3.00
Enhanced | Series E Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Shares issued			100,714
Shares price			$ 3.50
Issuance price			$ 0.4
P10 Intermediate | Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Percentage of aggregate shares outstanding, issued to third party				40.90%
Percentage of aggregate shares outstanding, issued to parent				59.10%
Conversion ratio				100.00%
Dividend rate, percentage				1.00%
P10 Intermediate | Series C Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Shares issued			3,337,470
Shares price			$ 3.00
Issuance price			$ 10.0
Gross value of TAB payment			16.8
P10 Intermediate | Common Stock
Class of Stock [Line Items]
Percentage of aggregate shares outstanding, issued to parent				100.00%
P10 Intermediate | Five Points Capital | Series A Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Proceeds from issuance of convertible preferred stock			$ 20.1
Shares issued			6,700,000
Shares issued, price per share			$ 3.00
P10 Intermediate | Five Points Capital | Series C Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Shares issued			333,333
Shares price			$ 3.00
P10 Intermediate | Enhanced | Series E Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Shares issued			7,686,925
Shares price			$ 3.50
Issuance price			$ 26.9
P10 Intermediate | Keystone Capital XXX, LLC | Series B Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Proceeds from issuance of convertible preferred stock			$ 30.0
Shares issued			10,000,000
Shares issued, price per share			$ 3.00
P10 Intermediate | Keystone Capital XXX, LLC | Call Option | Series B Preferred Stock
Class of Stock [Line Items]
Option indexed to issuer's equity, shares			5,000,000
Option indexed to issuer's equity, exercise price			$ 3