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Revenue - Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2021
Capitalized Contract Cost [Line Items] |  |  |
Current contract assets | $ 2,600 |  | $ 2,700
Non-current contract assets | 0 |  | 0
Current contract liabilities | 2,220 |  | 1,893
Non-current contract liabilities | 300 |  | 400
Revenue recognized included in contract liabilities | 400 |  |
Current capitalized costs | 116 |  | 137
Non-current capitalized costs | 0 |  |
Incremental costs amortized | 90 | $ 87 |
Impairment related to costs capitalized | $ 0 |  |
Payment terms | 30 days |  |
Practical Expedient, Incremental Costs | true |  |
Remaining Performance Obligation, Optional Exemption | true |  |
Minimum |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Amortization Period | 3 years |  |
Maximum |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Amortization Period | 6 years |  |
Europe | Maximum |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Payment terms | 90 days |  |
TS |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Current capitalized costs | $ 13 |  | 13
Non-current capitalized costs | 6 |  | 9
Incremental costs amortized | 3 | $ 3 |
Impairment related to costs capitalized | $ 0 |  | $ 0

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