Convertible Preferred Stock, Percentage Converted.

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- Definition

Decrease in the variable interest rate margin.

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- Definition

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

+ References

No definition available.

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- Definition

Value of convertible preferred stock that was converted to other securities.

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- Definition

Value of input used to measure debt instrument, including, but not limited to, convertible and non-convertible debt.

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- Definition

Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as an asset.

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- Definition

Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period.

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- Definition

Value of input used to measure embedded derivative liability.

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- Definition

Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

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- Definition

Amount of unrealized gain (loss) on investment in marketable security.

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- Definition

Per share conversion price of preferred stock.

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- Definition

Number of shares of stock issued during the period pursuant to acquisitions.

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Fair Value Measurements - Narrative (Details) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended			9 Months Ended		12 Months Ended
	Apr. 16, 2021 USD ($)	Oct. 31, 2021 USD ($) $ / shares shares	Aug. 31, 2021 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) shares	Jun. 30, 2021 shares	Sep. 30, 2020 shares	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) d shares	Dec. 31, 2019 shares	Dec. 31, 2018 shares	Feb. 28, 2021 USD ($)
Gain loss due to change in the fair value	$ 1,100			$ 0			$ 7,600	$ 0
Embedded derivative	$ 17,800											$ 5,600
Percentage of convertible security converted			50.00%
Convertible Security Stated Value			$ 20,000
Issuance of common stock warrants and options in connection with an acquisition (in shares) \| shares				405,205
Conversion price (in dollars per share) \| $ / shares			$ 49.4
Amended Revolving Credit Facility Member [Member] \| Affiliate Of Kkr Denali Member [Member]
Decrease In The Variable Interest Rate Margin	0.25%
Class A, Class B and Class F Common Stock [Member]
Issuance of common stock warrants and options in connection with an acquisition (in shares) \| shares				405,205	6,320,688	2,479,996
Class A, Class B and Class F Common Stock [Member] \| Common Class A [Member]
Issuance of common stock warrants and options in connection with an acquisition (in shares) \| shares			405,205						2,479,996	3,267,792	4,754,130
Fair Value, Inputs, Level 1 [Member]
Unrealized gain (loss) due to change in fair value of marketable securities				$ 400			5,200
Subsequent Event [Member]
Percentage of convertible security converted		50.00%
Convertible Security Stated Value		$ 20,000
Conversion price (in dollars per share) \| $ / shares		$ 61.7
Subsequent Event [Member] \| Class A, Class B and Class F Common Stock [Member] \| Common Class A [Member]
Issuance of common stock warrants and options in connection with an acquisition (in shares) \| shares		324,156
Convertible Debt Securities [Member]
Gain loss due to change in the fair value				$ 1,000			$ 3,500		$ 1,500
Convertible Debt, Fair Value Disclosures									$ 45,000
Convertible Debt Securities [Member] \| Measurement Input Expected Time of IPO Occurance First Quarter [Member]
Debt Instrument, Measurement Input \| d									50
Convertible Debt Securities [Member] \| Measurement Input Expected Time of IPO Occurance Second Quarter [Member]
Debt Instrument, Measurement Input \| d									25
Embedded Derivative Financial Instruments [Member]
Gain loss due to change in the fair value of embedded derivatives									$ 5,700
Embedded Derivative Financial Instruments [Member] \| Measurement Input Expected Time of IPO Occurance First Quarter [Member]
Embedded Derivative Liability, Measurement Input \| d									50
Embedded Derivative Financial Instruments [Member] \| Measurement Input Expected Time of IPO Occurance Second Quarter [Member]
Embedded Derivative Liability, Measurement Input \| d									25