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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2021
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets Measured on Recurring Basis | The following tables summarize the Company’s financial assets that are measured at fair value on a recurring basis (in thousands):
|  | December 31, 2021 |
|  | Level 1 |  |  | Level 2 |  |  | Total |
Cash equivalents: |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | - |  |  | $ | 69,999 |  |  | $ | 69,999 |
Money market funds |  |  | 23,857 |  |  |  | - |  |  |  | 23,857 |
Commercial paper |  |  | - |  |  |  | 4,999 |  |  |  | 4,999 |
Marketable securities: |  |  |  |  |  |  |  |  |
U.S. treasury securities |  |  | - |  |  |  | 446,435 |  |  |  | 446,435 |
Corporate notes and bonds |  |  | - |  |  |  | 125,604 |  |  |  | 125,604 |
U.S. agency obligations |  |  | - |  |  |  | 54,007 |  |  |  | 54,007 |
Commercial paper |  |  | - |  |  |  | 10,995 |  |  |  | 10,995 |
Municipal bonds |  |  | - |  |  |  | 3,044 |  |  |  | 3,044 |
Total |  | $ | 23,857 |  |  | $ | 715,083 |  |  | $ | 738,940 |
|  | December 31, 2020 |
|  | Level 1 |  |  | Level 2 |  |  | Total |
Cash equivalents: |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 12,409 |  |  | $ | - |  |  | $ | 12,409 |
Marketable securities: |  |  |  |  |  |  |  |  |
Corporate notes and bonds |  |  | - |  |  |  | 155,740 |  |  |  | 155,740 |
Commercial paper |  |  | - |  |  |  | 63,506 |  |  |  | 63,506 |
U.S. agency obligations |  |  | - |  |  |  | 32,510 |  |  |  | 32,510 |
Total |  | $ | 12,409 |  |  | $ | 251,756 |  |  | $ | 264,165 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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