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Marketable Securities | 9 Months Ended
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Sep. 30, 2021
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:
| 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 |
The Company had sixteen and six separate marketable securities in unrealized loss positions as of September 30, 2021 and December 31, 2020, respectively. The Company did not identify any marketable securities that were other-than-temporarily impaired as of September 30, 2021 and December 31, 2020. 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 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 http://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 http://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 http://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 http://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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