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Stockholders' Equity - Summary of Stockholders' Equity (Detail) - shares | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Class A Common Stock |  |  |
Class Of Stock [Line Items] |  |  |
Common stock, shares outstanding, beginning balance | 12,435,557 | 2,426,107 | 2,419,107
Share conversion |  | 10,000,000 |
Issued | 7,500 | 9,450 | 7,000
Common stock, shares outstanding, ending balance | 12,443,057 | 12,435,557 | 2,426,107
Class B Common Stock |  |  |
Class Of Stock [Line Items] |  |  |
Common stock, shares outstanding, beginning balance |  | 10,000,000 | 10,000,000
Share conversion |  | (10,000,000) |
Common stock, shares outstanding, ending balance |  |  | 10,000,000

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