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Revenue - Deferred revenue and other income (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Change in Contract with Customer, Asset and Liability [Roll Forward] |  |
Beginning deferred revenue and other income | $ 8,939 |
Additions | 5,438 |
Amount of deferred revenue and other income recognized in the statement of operations | (6,438) |
Ending deferred revenue and other income | 7,939 |
Current deferred revenue and other income | 7,939 | $ 8,370
Long-term deferred revenue and other income | $ 0 | $ 569

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