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Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2022
Investments [Abstract] |
Marketable Securities | The amortized cost, unrealized gain (loss), and estimated fair value of the Company's investments in securities available for sale consisted of the following:
| June 30, 2022
| Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value
Marketable securities |  |  |  |  |  |  |
U.S. government securities | $ | 420,162 |  |  | $ | — |  |  | $ | (9,713) |  |  | $ | 410,449 |
Commercial paper | 18,972 |  | — |  | — |  |  | 18,972
Corporate debt securities | 15,631 |  | — |  | (179) |  |  | 15,452
Total marketable securities | $ | 454,765 |  |  | $ | — |  |  | $ | (9,892) |  |  | $ | 444,873 |
| December 31, 2021
| Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value
Marketable securities |  |  |  |  |  |  |
U.S. government securities | $ | 420,392 |  |  | $ | — |  |  | $ | (2,107) |  |  | $ | 418,285 |
Commercial paper | 13,878 |  | — |  | — |  |  | 13,878
Asset-backed securities | 2,003 |  | — |  | (1) |  |  | 2,002
Corporate debt securities | 18,731 |  | 3 |  | (24) |  |  | 18,710
Total marketable securities | $ | 455,004 |  |  | $ | 3 |  |  | $ | (2,132) |  |  | $ | 452,875 |
Schedule of Available-for-sale Securities Reconciliation | The following table summarizes the stated maturities of the Company’s marketable securities:
| June 30, 2022 |  | December 31, 2021
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Due within one year | $ | 342,294 |  |  | $ | 335,772 |  |  | $ | 64,914 |  |  | $ | 64,879 |
Due after one year through two years | 112,471 |  | 109,101 |  | 390,090 |  | 387,996
Total | $ | 454,765 |  |  | $ | 444,873 |  |  | $ | 455,004 |  |  | $ | 452,875 |

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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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