Summary of Significant Accounting Policies - Contract acquisition costs (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||||
|---|---|---|---|---|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2019 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2019 |
Dec. 31, 2020 |
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| Summary of Significant Accounting Policies | |||||||
| Deferred asset | $ 3.4 | $ 3.4 | $ 2.3 | ||||
| Amortized commissions | $ 1.3 | $ 0.1 | $ 0.1 | $ 1.6 | $ 0.3 | $ 0.1 | |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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