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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2021
Fair Value Disclosures [Abstract] |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis | The following tables set forth the amortized cost, gross unrealized gains, gross unrealized losses, and fair values of the Company’s marketable securities accounted for as available-for-sale securities as of December 31, 2021 and 2020 (in thousands):
|  | December 31, 2021
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Financial Assets: |  |  |  |  |  |  |  |
Short-term marketable securities: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 52,791 |  |  | $ | 11 |  |  | $ | (138) |  |  | $ | 52,664 |
Yankee bonds |  | 6,175 |  |  | 1 |  |  | (16) |  |  | 6,160 |
Agency bonds |  | 17,546 |  |  | — |  |  | (16) |  |  | 17,530 |
Municipal bonds |  | 12,440 |  |  | — |  |  | (211) |  |  | 12,229 |
Commercial paper |  | 17,694 |  |  | — |  |  | (4) |  |  | 17,690 |
Asset-backed securities |  | 27,620 |  |  | 1 |  |  | (86) |  |  | 27,535 |
Corporate bonds |  | 65,198 |  |  | 9 |  |  | (452) |  |  | 64,755 |
Total |  | $ | 199,464 |  |  | $ | 22 |  |  | $ | (923) |  |  | $ | 198,563 |
|  | December 31, 2020
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Financial Assets: |  |  |  |  |  |  |  |
Short-term marketable securities: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 21,357 |  |  | $ | 1 |  |  | $ | (18) |  |  | $ | 21,340 |
Commercial paper |  | 14,543 |  |  | — |  |  | — |  |  | 14,543 |
Asset-backed securities |  | 14,546 |  |  | — |  |  | (8) |  |  | 14,538 |
Corporate bonds |  | 17,144 |  |  | — |  |  | (19) |  |  | 17,125 |
Total |  | $ | 67,590 |  |  | $ | 1 |  |  | $ | (45) |  |  | $ | 67,546 |
Investments Classified by Contractual Maturity Date | The following tables set forth the fair value of available-for-sale marketable securities by contractual maturity at December 31, 2021 and 2020 (in thousands):
|  | December 31, 2021
|  | One Year or Less |  | Over One Year Through Five Years |  | Over Five Years |  | Total
Financial Assets: |  |  |  |  |  |  |  |
Marketable Securities: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 22,550 |  |  | $ | 30,114 |  |  | $ | — |  |  | $ | 52,664 |
Yankee bonds |  | 4,150 |  |  | 2,010 |  |  | — |  |  | 6,160 |
Agency bonds |  | 14,041 |  |  | 3,489 |  |  | — |  |  | 17,530 |
Municipal bonds |  | — |  |  | 12,229 |  |  | — |  |  | 12,229 |
Commercial paper |  | 17,690 |  |  | — |  |  | — |  |  | 17,690 |
Asset-backed securities |  | 20,868 |  |  | 6,667 |  |  | — |  |  | 27,535 |
Corporate bonds |  | 25,412 |  |  | 39,343 |  |  | — |  |  | 64,755 |
Total |  | $ | 104,711 |  |  | $ | 93,852 |  |  | $ | — |  |  | $ | 198,563 |
|  | December 31, 2020
|  | One Year or Less |  | Over One Year Through Five Years |  | Over Five Years |  | Total
Financial Assets: |  |  |  |  |  |  |  |
Marketable Securities: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 6,075 |  |  | $ | 15,265 |  |  | $ | — |  |  | $ | 21,340 |
Commercial paper |  | 14,543 |  |  | — |  |  | — |  |  | 14,543 |
Asset-backed securities |  | 560 |  |  | 13,978 |  |  | — |  |  | 14,538 |
Corporate bonds |  | 5,863 |  |  | 11,262 |  |  | — |  |  | 17,125 |
Total |  | $ | 27,041 |  |  | $ | 40,505 |  |  | $ | — |  |  | $ | 67,546 |
Fair Value, Assets Measured on Recurring Basis | The following tables set forth the Company’s cash equivalents and marketable securities accounted for as available-for-sale securities that were measured at fair value on a recurring basis based on the fair value hierarchy as of December 31, 2021 and 2020 (in thousands):
|  | December 31, 2021
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Financial Assets: |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |
Money market funds |  | $ | 254,157 |  |  | $ | — |  |  | $ | — |  |  | $ | 254,157 |
Commercial paper |  | — |  |  | 22,491 |  |  | — |  |  | 22,491 |
Marketable securities: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | 52,664 |  |  | — |  |  | — |  |  | 52,664 |
Yankee bonds |  | 6,160 |  |  | — |  |  | — |  |  | 6,160 |
Agency bonds |  | 17,530 |  |  | — |  |  | — |  |  | 17,530 |
Municipal bonds |  | 12,229 |  |  | — |  |  | — |  |  | 12,229 |
Commercial paper |  | — |  |  | 17,690 |  |  | — |  |  | 17,690 |
Asset-backed securities |  | — |  |  | 27,535 |  |  | — |  |  | 27,535 |
Corporate bonds |  | — |  |  | 64,755 |  |  | — |  |  | 64,755 |
Total |  | $ | 342,740 |  |  | $ | 132,471 |  |  | $ | — |  |  | $ | 475,211 |
|  | December 31, 2020
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Financial Assets: |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |
Money market funds |  | $ | 209,141 |  |  | $ | — |  |  | $ | — |  |  | $ | 209,141 |
U.S. Treasury securities |  | 1,000 |  |  | — |  |  | — |  |  | 1,000 |
Commercial paper |  | — |  |  | 3,999 |  |  | — |  |  | 3,999 |
Marketable securities: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | 21,340 |  |  | — |  |  | — |  |  | 21,340 |
Commercial paper |  | — |  |  | 14,543 |  |  | — |  |  | 14,543 |
Asset-backed securities |  | — |  |  | 14,538 |  |  | — |  |  | 14,538 |
Corporate bonds |  | — |  |  | 17,125 |  |  | — |  |  | 17,125 |
Total |  | $ | 231,481 |  |  | $ | 50,205 |  |  | $ | — |  |  | $ | 281,686 |

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- Definition Tabular disclosure of assets measured at fair value measured on a recurring or nonrecurring basis. Includes, but is not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. + 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 (a) -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 (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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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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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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