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v3.20.4

Long-Term Debt - Notes Payable to BMI - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |
Repayment of note payable |  | $ 58.5 | $ 11.2 | $ 12.6
BMI | Bank note payable | Meadows Bank |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayment of note payable | $ 8.5 |  |  |
BMI | 2017 Bank Loan | Bank note payable | Western Alliance Bank |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount of loan agreement | 20.5 |  |  |
Frequency of debt instrument payment |  | semi-annual |  |
Debt instrument, payment terms |  | The agreement requires semi-annual payments of principal and interest on June 1 and December 1 aggregating $1.9 million annually beginning on June 1, 2017 through the maturity date in June 2032. |  |
Periodic principal and interest payments | $ 1.9 |  |  |
Loans maturity period | 2032-06 |  |  |
Interest rate | 5.34% |  |  |
Debt issuance cost |  | $ 0.6 |  |

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