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Revenue Recognition - Additional Information (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Jan. 01, 2021 | Dec. 31, 2020
Disaggregation Of Revenue [Line Items] |  |  |
Allowances for product returns | $ 300 |  |
Estimated life of particular model phone | 4 years |  |
Contract liabilities | $ 0 | $ 5 | $ 5
Other Assets |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total capitalized costs | $ 2,684 |  | $ 2,889

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