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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2021
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:
| September 30, 2021
| Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value
Marketable securities |  |  |  |  |  |  |
U.S. government securities | $ | 374,849 |  |  | $ | 1 |  |  | $ | (257) |  |  | $ | 374,593 |
Commercial paper | 16,880 |  | — |  | — |  |  | 16,880
Asset-backed securities | 2,017 |  | — |  | — |  |  | 2,017
Corporate debt securities | 15,468 |  | 3 |  | (7) |  |  | 15,464
Total marketable securities | $ | 409,214 |  |  | $ | 4 |  |  | $ | (264) |  |  | $ | 408,954 |
| December 31, 2020
| Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value
Marketable securities |  |  |  |  |  |  |
U.S. government securities | $ | 125,823 |  |  | $ | 47 |  |  | $ | (6) |  |  | $ | 125,864 |
Commercial paper | 4,991 |  | — |  | — |  |  | 4,991
Asset-backed securities | 4,294 |  | 21 |  | — |  |  | 4,315
Corporate debt securities | 14,683 |  | 52 |  | (2) |  |  | 14,733
Total marketable securities | $ | 149,791 |  |  | $ | 120 |  |  | $ | (8) |  |  | $ | 149,903 |
Schedule of Available-for-sale Securities Reconciliation | The following table summarizes the stated maturities of the Company’s marketable securities:
| September 30, 2021 |  | December 31, 2020
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Due within one year | $ | 56,756 |  |  | $ | 56,756 |  |  | $ | 149,791 |  |  | $ | 149,903 |
Due after one year through two years | 352,458 |  | 352,198 |  | — |  | —
Total | $ | 409,214 |  |  | $ | 408,954 |  |  | $ | 149,791 |  |  | $ | 149,903 |

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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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