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Stockholders' Equity - Summary of Stockholders' Equity (Detail) - shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Class Of Stock [Line Items] |  |  |  |  |
Common stock, shares issued, beginning balance |  | 12,451,157 | 12,451,157 | 12,443,057 | 12,435,557
Common stock, shares outstanding, beginning balance |  | 12,451,157 | 12,451,157 | 12,443,057 | 12,435,557
Issued |  |  | 4,500 | 8,100 | 7,500
Acquired |  |  | (75,000) | 0 | 0
Acquired, Outstanding |  |  | (75,000) |  |
Retired, Issued |  |  | (75,000) |  |
Retired |  |  | 75,000 |  |
Common stock, shares issued, ending balance | 12,380,657 |  | 12,380,657 | 12,451,157 | 12,443,057
Common stock, shares outstanding, ending balance | 12,380,657 |  | 12,380,657 | 12,451,157 | 12,443,057
Class A Common Stock |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Common stock, shares issued, beginning balance |  | 12,451,157 | 12,451,157 |  |
Common stock, shares outstanding, beginning balance |  | 12,380,657 | 12,380,657 |  |
Acquired, Outstanding | (25,000) | (50,000) | (75,000) |  |
Common stock, shares issued, ending balance | 12,451,157 |  | 12,451,157 | 12,451,157 |
Common stock, shares outstanding, ending balance | 12,380,657 |  | 12,380,657 | 12,380,657 |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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