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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2022
Fair Value Disclosures [Abstract] |
Summary of Assets and Liabilities Measured At Fair Value on Recurring Basis | Assets and liabilities measured at fair value on a recurring basis are summarized below:
| Fair Value Measurements as of As of March 31, 2022
| Fair Value Measurement |  | Balance Sheet Classification
| Fair Value Level |  | Cost Basis |  | Unrealized Gains (Losses) |  | Market Value |  | Cash and Cash Equivalents |  | Short-term Investments and Marketable Securities |  | Other Assets
Money market funds | Level 1 |  | $ | 47,066 |  |  | $ | — |  |  | $ | 47,066 |  |  | $ | 47,066 |  |  | $ | — |  |  | $ | — |
Certificates of Deposit | Level 2 |  | 2,449 |  |  | (2) |  |  | 2,447 |  |  | 350 |  |  | 2,097 |  |  | — |
Commercial paper | Level 2 |  | 44,185 |  |  | — |  |  | 44,185 |  |  | 14,555 |  |  | 29,630 |  |  | — |
Short-Term Bond Mutual Fund | Level 2 |  | 100,074 |  |  | (400) |  |  | 99,673 |  |  | — |  |  | 99,673 |  |  | — |
Corporate bonds | Level 2 |  | 231,766 |  |  | (3,093) |  |  | 228,673 |  |  | 3,733 |  |  | 224,940 |  |  | — |
Israeli severance funds | Level 2 |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,014 |
Total Investment |  |  | $ | 425,540 |  |  | $ | (3,495) |  |  | $ | 422,044 |  |  | $ | 65,704 |  |  | $ | 356,340 |  |  | $ | 2,014 |
| Fair Value Measurements as of December 31, 2021
(in thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Total
Description |  |  |  |  |  |  |
Money market funds a | $ | 485,521 |  |  | $ | — |  |  | $ | — |  |  | $ | 485,521 |
Israeli severance funds b | $ | — |  |  | $ | 2,070 |  |  | $ | — |  |  | $ | 2,070 |
a.Money market funds at December 31, 2021 are recorded in cash and cash equivalents. b.We partially fund a liability for our Israeli severance requirement through monthly deposits into fund accounts, the value of these contributions are recorded to non-current assets on the consolidated balance sheet.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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