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Stockholder's Equity - Cumulative Convertible Preferred Stock (Detail) - shares | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Convertible Preferred Stock [Line Items] |  |
Shares issued and outstanding | 10,000 | 10,000
Series A [Member] |  |
Convertible Preferred Stock [Line Items] |  |
Shares issued and outstanding | 10,000 | 10,000
Conversion factor | 2.50% | 2.50%
Common shares resulting if converted | 25,000 | 25,000

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