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Marketable Securities | 3 Months Ended
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Mar. 31, 2022
Investments Debt And Equity Securities [Abstract] |
Marketable Securities | 4. Marketable Securities The following is a summary of the Company’s marketable securities.
(in thousands) |  | Amortized Cost |  |  | Gross unrealized gain |  |  | Gross unrealized loss |  |  | Fair Value |
March 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | 180,532 |  |  | $ | — |  |  | $ | (2,237 | ) |  | $ | 178,295 |
Commercial paper |  |  | 36,336 |  |  |  | — |  |  |  | (76 | ) |  |  | 36,260 |
Total |  | $ | 216,868 |  |  | $ | — |  |  | $ | (2,313 | ) |  | $ | 214,555 |
December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | 193,798 |  |  | $ | 1 |  |  | $ | (696 | ) |  | $ | 193,103 |
Commercial paper |  |  | 66,318 |  |  |  | 1 |  |  |  | (17 | ) |  |  | 66,302 |
Total |  | $ | 260,116 |  |  | $ | 2 |  |  | $ | (713 | ) |  | $ | 259,405 |
The Company’s marketable securities generally have contractual maturity dates of 15 months or less. The Company believes that any unrealized losses associated with the decline in value of its securities is temporary, is primarily related to market factors and believes that it is more likely than not that it will be able to hold its debt securities to maturity. Therefore, the Company anticipates a full recovery of the amortized cost basis of its debt securities at maturity and an allowance for credit losses was not recognized.

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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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