Summary of Significant Accounting Policies - Contract balances from contracts with customers (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | |
|---|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2021 |
Dec. 31, 2020 |
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| Summary of Significant Accounting Policies | |||
| Contract assets | $ 900 | $ 900 | $ 0 |
| Long-term contract assets | 2,582 | 2,582 | $ 0 |
| Recognition of revenue that was previously included in the deferred revenue balance | 500 | (2,300) | |
| Rollforward of deferred revenue | |||
| Balance at the beginning | 4,197 | ||
| Revenue recognized | 500 | (6,356) | |
| Revenue deferred | 8,815 | ||
| Balance at the end | $ 6,656 | $ 6,656 |
| X | ||||||||||
- Definition Amount of revenue deferred during the period. No definition available.
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| X | ||||||||||
- Definition Amount of recognition of revenue that was previously included in the deferred revenue balance. No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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