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Marketable Securities | 6 Months Ended
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Jun. 30, 2022
Investments [Abstract] |
Marketable Securities | 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 |
The Company had eighteen and eight separate marketable securities in unrealized loss positions as of June 30, 2022 and December 31, 2021, respectively. The Company did not identify any marketable securities that were other-than-temporarily impaired as of June 30, 2022 and December 31, 2021. The Company does not intend to sell any marketable securities that have unrealized losses on June 30, 2022 and it is not more likely than not that the Company will be required to sell such securities before any anticipated recovery. 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 The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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