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Revenues - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2020
Revenue from contract with customer [Line Items] |  |  |  |
Deferred revenue | $ 3,488 |  | $ 3,488 | $ 4,811
Long-term Contract [Member] |  |  |  |
Revenue from contract with customer [Line Items] |  |  |  |
Deferred revenue | 1,148 |  | 1,148 | 1,595
Up Front Payment Arrangement [Member] |  |  |  |
Revenue from contract with customer [Line Items] |  |  |  |
Deferred revenue | $ 2,340 |  | $ 2,340 | $ 3,216
Customer One [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |  |
Revenue from contract with customer [Line Items] |  |  |  |
Percentage of concentration risk |  |  | 13.00% |
Customer One [Member] | Net Consolidated Revenue [Member] | Customer Concentration Risk [Member] |  |  |  |
Revenue from contract with customer [Line Items] |  |  |  |
Percentage of concentration risk | 14.00% | 11.00% |  |
Customer Two [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |  |
Revenue from contract with customer [Line Items] |  |  |  |
Percentage of concentration risk |  |  |  | 11.00%
Customer Two [Member] | Net Consolidated Revenue [Member] | Customer Concentration Risk [Member] |  |  |  |
Revenue from contract with customer [Line Items] |  |  |  |
Percentage of concentration risk |  |  | 10.00% |

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