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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2021
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 September 30, 2021 and December 31, 2020 consisted of the following (in thousands):
|  |  |  | As of September 30, 2021 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Estimated |
|  |  |  |  |  |  |  |  |  |  |  |  | Allowance |  |  | Fair |
|  |  |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | for Credit |  |  | Market |
|  | Maturity |  | Cost |  |  | Gains |  |  | Losses |  |  | Losses |  |  | Value |
Certificates of deposits |  | Within 1 year |  | $ | 2,853 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | — |  |  | $ | 2,852 |
U.S. Treasury securities |  | Within 1 year |  |  | 10,066 |  |  |  | 1 |  |  |  | — |  |  |  | — |  |  | $ | 10,067 |
Certificates of deposits |  | 1 year to 2 years |  |  | 3,137 |  |  |  | — |  |  |  | (2 | ) |  |  | — |  |  |  | 3,135 |
U.S. Treasury securities |  | 1 year to 2 years |  |  | 20,004 |  |  |  | — |  |  |  | (2 | ) |  |  | — |  |  |  | 20,002 |
Total |  |  |  | $ | 36,060 |  |  | $ | 1 |  |  | $ | (5 | ) |  | $ | — |  |  | $ | 36,056 |
|  |  |  | As of December 31, 2020 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Estimated |
|  |  |  |  |  |  |  |  |  |  |  |  | Allowance |  |  | Fair |
|  |  |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | for Credit |  |  | Market |
|  | Maturity |  | Cost |  |  | Gains |  |  | Losses |  |  | Losses |  |  | Value |
Certificates of deposits |  | Within 1 year |  | $ | 1,750 |  |  | $ | 4 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,754 |
U.S. Treasury securities |  | Within 1 year |  |  | 31,806 |  |  |  | 152 |  |  |  | — |  |  |  | — |  |  |  | 31,958 |
Total |  |  |  | $ | 33,556 |  |  | $ | 156 |  |  | $ | — |  |  | $ | — |  |  | $ | 33,712 |

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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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