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Investments - Investments in Variable Interest Entities (Detail) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Maximum Exposure to Loss |  | $ 4,800,000 | $ 2,800,000
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Investment | [1] | 1,258,000 | 4,699,000
Maximum Exposure to Loss | [1] | $ 2,238,000 | $ 5,679,000
[1] | The Company has entered into a subordinated loan agreement with Aqua, whereby the Company agreed to lend the principal sum of $980 thousand. As of December 31, 2020 and 2019, the Company’s maximum exposure to loss with respect to its unconsolidated VIEs includes the sum of its equity investments in its unconsolidated VIEs and the $980 thousand subordinated loan to Aqua.

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