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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract] |
Disclosure - Investment Securities - Summary of Cost, Gross Unrealized Holding Gains and Losses, Allowances for Credit Losses and Fair Value of Available-for-Sale Investments by Types, Maturities and Classes of Securities (Detail) | The cost, gross unrealized holding gains, gross unrealized holding losses, allowances for credit losses and fair value of available-for-sale investments by types, maturities and classes of securities at March 31, 2022 and December 31, 2021 consisted of the following (in thousands):
|  |  |  | As of March 31, 2022 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Estimated |
|  |  |  |  |  |  |  |  |  |  |  |  | Allowance |  |  | Fair |
|  |  |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | for Credit |  |  | Market |
|  | Maturity |  | Cost |  |  | Gains |  |  | Losses |  |  | Losses |  |  | Value |
Certificates of deposits |  | Within 1 year |  | $ | 3,098 |  |  | $ | — |  |  | $ | (9 | ) |  | $ | — |  |  | $ | 3,089 |
U.S. Treasury securities |  | Within 1 year |  |  | 30,083 |  |  |  | — |  |  |  | (254 | ) |  |  | — |  |  |  | 29,829 |
Certificates of deposits |  | 1 year to 2 years |  |  | 2,188 |  |  |  | — |  |  |  | (33 | ) |  |  | — |  |  |  | 2,155 |
U.S. Treasury securities |  | 1 year to 2 years |  |  | 49,861 |  |  |  | — |  |  |  | (1,026 | ) |  |  | — |  |  |  | 48,835 |
Total |  |  |  | $ | 85,230 |  |  | $ | — |  |  | $ | (1,322 | ) |  | $ | — |  |  | $ | 83,908 |
|  |  |  | As of December 31, 2021 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Estimated |
|  |  |  |  |  |  |  |  |  |  |  |  | Allowance |  |  | Fair |
|  |  |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | for Credit |  |  | Market |
|  | Maturity |  | Cost |  |  | Gains |  |  | Losses |  |  | Losses |  |  | Value |
Certificates of deposits |  | Within 1 year |  | $ | 2,896 |  |  | $ | — |  |  | $ | (3 | ) |  | $ | — |  |  | $ | 2,893 |
U.S. Treasury securities |  | Within 1 year |  | $ | 15,045 |  |  |  | — |  |  |  | (23 | ) |  |  |  |  | $ | 15,022 |
Certificates of deposits |  | 1 year to 2 years |  | $ | 2,887 |  |  |  | — |  |  |  | (9 | ) |  |  |  |  | $ | 2,878 |
U.S. Treasury securities |  | 1 year to 2 years |  |  | 64,911 |  |  |  | — |  |  |  | (209 | ) |  |  | — |  |  |  | 64,702 |
Total |  |  |  | $ | 85,739 |  |  | $ | — |  |  | $ | (244 | ) |  | $ | — |  |  | $ | 85,495 |

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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