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Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract] |
Schedule of Cash Equivalents and Marketable Securities | The following table summarizes, by major security type, our restricted cash, cash equivalents, and marketable securities that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy (in thousands):
| June 30, 2022 |  | December 31, 2021
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  | Fair Value
Level 1: |  |  |  |  |  |  |  |  |
Restricted cash: |  |  |  |  |  |  |  |  |
Restricted cash | $ | 10,755 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,755 |  |  | $ | 10,823 |
Total restricted cash | $ | 10,755 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,755 |  |  | $ | 10,823 |
Level 1 securities: |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |
Money market funds | $ | 166,174 |  |  | $ | — |  |  | $ | — |  |  | $ | 166,174 |  |  | $ | 73,138 |
Total cash equivalents | $ | 166,174 |  |  | $ | — |  |  | $ | — |  |  | $ | 166,174 |  |  | $ | 73,138 |
Level 2 securities: |  |  |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |  |  |
Commercial paper | $ | 127,113 |  |  | $ | — |  |  | $ | — |  |  | $ | 127,113 |  |  | $ | 59,792 |
Asset-backed securities | 28,317 |  |  | — |  |  | (90) |  |  | 28,227 |  |  | 40,942 |
Corporate bonds | 208,362 |  |  | — |  |  | (3,465) |  |  | 204,897 |  |  | 237,402 |
U.S. treasury securities | 181,344 |  |  | — |  |  | (2,164) |  |  | 179,180 |  |  | 272,300 |
Supranational bonds | 53,027 |  |  | — |  |  | (969) |  |  | 52,058 |  |  | 70,887 |
Total marketable securities | $ | 598,163 |  |  | $ | — |  |  | $ | (6,688) |  |  | $ | 591,475 |  |  | $ | 681,323 |
Schedule of Cash Equivalents | The following table summarizes, by major security type, our restricted cash, cash equivalents, and marketable securities that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy (in thousands):
| June 30, 2022 |  | December 31, 2021
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  | Fair Value
Level 1: |  |  |  |  |  |  |  |  |
Restricted cash: |  |  |  |  |  |  |  |  |
Restricted cash | $ | 10,755 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,755 |  |  | $ | 10,823 |
Total restricted cash | $ | 10,755 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,755 |  |  | $ | 10,823 |
Level 1 securities: |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |
Money market funds | $ | 166,174 |  |  | $ | — |  |  | $ | — |  |  | $ | 166,174 |  |  | $ | 73,138 |
Total cash equivalents | $ | 166,174 |  |  | $ | — |  |  | $ | — |  |  | $ | 166,174 |  |  | $ | 73,138 |
Level 2 securities: |  |  |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |  |  |
Commercial paper | $ | 127,113 |  |  | $ | — |  |  | $ | — |  |  | $ | 127,113 |  |  | $ | 59,792 |
Asset-backed securities | 28,317 |  |  | — |  |  | (90) |  |  | 28,227 |  |  | 40,942 |
Corporate bonds | 208,362 |  |  | — |  |  | (3,465) |  |  | 204,897 |  |  | 237,402 |
U.S. treasury securities | 181,344 |  |  | — |  |  | (2,164) |  |  | 179,180 |  |  | 272,300 |
Supranational bonds | 53,027 |  |  | — |  |  | (969) |  |  | 52,058 |  |  | 70,887 |
Total marketable securities | $ | 598,163 |  |  | $ | — |  |  | $ | (6,688) |  |  | $ | 591,475 |  |  | $ | 681,323 |
Schedule of Amortized Cost and Fair Value of Our Marketable Securities | The following table summarizes the amortized cost and fair value of our marketable securities as of June 30, 2022, by contractual years to maturity (in thousands):
| Amortized Cost |  | Fair Value
Due within one year | $ | 542,211 |  |  | $ | 537,242 |
Due between one and two years | 55,952 |  |  | 54,233 |
Total | $ | 598,163 |  |  | $ | 591,475 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 + Details
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