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Stockholder's Equity - Cumulative Convertible Preferred Stock (Detail) - shares shares in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Convertible Preferred Stock [Line Items] |  |
Shares issued and outstanding | 10 | 10
Series A [Member] |  |
Convertible Preferred Stock [Line Items] |  |
Shares issued and outstanding | 10 | 10
Conversion factor | 2.50% | 2.50%
Common shares resulting if converted | 25 | 25

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