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Investments - Summary of Available for Sale Securities (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Total |  |
Total, amortized cost | $ 11,735 | $ 11,409
Total, gross unrealized gains | 246 | 2,023
Total, gross unrealized losses | (80) | (63)
Total, estimated fair value | 11,901 | 13,369
Mutual funds |  |
Equity securities |  |
Equity securities, amortized cost | 6,352 | 6,001
Equity securities, gross unrealized gains | 0 | 1,649
Equity securities, gross unrealized losses | (11) | 0
Equity securities, estimated fair value | 6,341 | 7,650
U.S. Government and agency securities |  |
Available-for-sale securities |  |
Available-for-sale securities, amortized cost | 3,247 | 2,742
Available-for-sale securities, gross unrealized gains | 10 | 0
Available-for-sale securities, gross unrealized losses | (4) | (4)
Available-for-sale securities, estimated fair value | 3,253 | 2,738
Corporate bonds |  |
Available-for-sale securities |  |
Available-for-sale securities, amortized cost | 2,033 | 2,559
Available-for-sale securities, gross unrealized gains | 236 | 374
Available-for-sale securities, gross unrealized losses | (4) | (7)
Available-for-sale securities, estimated fair value | 2,265 | 2,926
Asset-backed securities and collateralized mortgage obligations |  |
Available-for-sale securities |  |
Available-for-sale securities, amortized cost | 103 | 107
Available-for-sale securities, gross unrealized gains | 0 | 0
Available-for-sale securities, gross unrealized losses | (61) | (52)
Available-for-sale securities, estimated fair value | $ 42 | $ 55

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