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Revenues - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Disaggregation Of Revenue [Line Items] |  |  |
Deferred revenue, recognized |  | $ 800 |
Deferred revenue |  | 701 | $ 1,572
Circle [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Deferred revenue, recognized | $ 600 |  |
Deferred revenue |  | $ 700 |
Contract termination date |  | Apr. 15, 2021 |
Amortization of intangible assets remaining | $ 300 |  |
Finite lived intangible assets remaining amortization |  | $ 400 |
Circle [Member] | Selling and Marketing Expense [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Impairment charge of intangible assets |  | $ 1,500 |

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