| Fair Value of Financial Instruments - Changes in Fair Value (Details) $ in Thousands | 9 Months Ended | 
|---|---|
| Sep. 30, 2021  USD ($) | |
| Contingent consideration | |
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | |
| Beginning balance | $ 1,257 | 
| Additions | 338 | 
| Changes in fair value | 10,891 | 
| Settlements | (11,598) | 
| Ending balance | 888 | 
| Private warrants | |
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | |
| Beginning balance | 0 | 
| Additions | 21,727 | 
| Changes in fair value | (2,938) | 
| Settlements | 0 | 
| Ending balance | $ 18,789 | 
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available. 
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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). Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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