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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 |  |  |

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