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Long-Term Debt (3.90% Promissory Note) - Additional Information (Detail) $ in Thousands |  |  | 9 Months Ended
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Mar. 19, 2020 | Feb. 28, 2020 USD ($) | Sep. 30, 2020 USD ($)
Debt Instrument [Line Items] |  |  |
Proceeds from issuance of long-term debt |  |  | $ 10,000
3.90% Promissory Note [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate |  |  | 3.90%
Outstanding principal and interest payment due date |  |  | Apr. 01, 2032
American Equity Investment Life Insurance Company [Member] | 3.90% Promissory Note [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from issuance of long-term debt |  | $ 10,000 |
Fixed interest rate |  | 3.90% |
Debt instrument frequency of periodic payment |  | monthly |
Debt instrument periodic payment |  | $ 60 |
Number of installment payments |  | 143 |
Date of initial payment |  | Apr. 01, 2020 |
Debt instrument, balloon payment to be paid |  | $ 5,007 |
Outstanding principal and interest payment due date |  | Mar. 01, 2032 |
Debt instruments, payment terms description |  | The promissory note may be repaid in full at any time as long as the Company provides at least 60 days’ written notice and pays a prepayment premium and processing fee. |
Revised date of initial payment | May 01, 2020 |  |
Outstanding principal and interest payment revised due date | Apr. 01, 2032 |  |

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