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Cash, Cash Equivalents, Restricted Cash and Short-Term Investments | 9 Months Ended
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Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract] |
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments | Cash, Cash Equivalents, Restricted Cash and Short-Term Investments As of September 30, 2022 and December 31, 2021, the Company had $376.6 million and $466.1 million, respectively of cash, cash equivalents, restricted cash and short-term investments summarized below. As of September 30, 2022, $376.6 million were available-for-sale debt securities which are carried at fair market value. As of December 31, 2021, $446.9 million were classified as available-for-sale and $19.2 million were held-to-maturity.
|  | September 30, 2022
(in thousands) |  | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Estimated Fair Value
Cash, cash equivalents and restricted cash |  | $ | 86,052 |  |  | $ | — |  |  | $ | — |  |  | $ | 86,052 |
U.S. agency security |  | 4,900 |  |  | 4 |  |  | — |  |  | 4,904 |
Corporate bond |  | 98,448 |  |  | — |  |  | (380) |  |  | 98,068 |
Commercial paper |  | 112,833 |  |  | — |  |  | (200) |  |  | 112,633 |
Treasury bill |  | 26,721 |  |  | — |  |  | (17) |  |  | 26,704 |
Treasury bond |  | 44,670 |  |  | — |  |  | (117) |  |  | 44,553 |
Yankee bond |  | 3,742 |  |  | — |  |  | (12) |  |  | 3,730 |
Total cash, cash equivalents, restricted cash and short-term investments |  | $ | 377,366 |  |  | $ | 4 |  |  | $ | (726) |  |  | $ | 376,644 |
|  | December 31, 2021
(in thousands) |  | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Estimated Fair Value
Cash, cash equivalents and restricted cash |  | $ | 231,900 |  |  | $ | — |  |  | $ | — |  |  | $ | 231,900 |
Certificates of deposit |  | 3,144 |  |  | — |  |  | (4) |  |  | 3,140 |
Corporate bond |  | 2,592 |  |  | — |  |  | (1) |  |  | 2,591 |
Commercial paper |  | 206,764 |  |  | — |  |  | (40) |  |  | 206,724 |
Treasury bill |  | 2,497 |  |  | — |  |  | (2) |  |  | 2,495 |
Total |  | $ | 446,897 |  |  | $ | — |  |  | $ | (47) |  |  | $ | 446,850 |
Total held to maturity securities at amortized cost |  |  |  |  |  |  |  | 19,228 |
Total cash, cash equivalents, restricted cash and short-term investments |  |  |  |  |  |  |  | $ | 466,078 |
As of September 30, 2022 and December 31, 2021, accrued interest receivable from the investments were $0.7 million and $0.1 million, respectively. During the three and nine months ended September 30, 2022, the Company had $0.3 million and $0.7 million unrealized gains and losses on available-for-sale securities, net of tax, respectively, which are included as a component of comprehensive loss on the consolidated statements of operations. Currently, the Company does not intend to sell investments that are in an unrealized loss position, and it is unlikely we will be required to sell the investments before recovery of their amortized cost basis, which may be at maturity. We have determined that the gross unrealized losses on our investments at September 30, 2022, were temporary in nature. Realized gains or losses were immaterial during the three and nine months ended September 30, 2022 and 2021. The Company's short-term investments as of September 30, 2022 mature at various dates through June 2023.

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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 https://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 https://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 https://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 https://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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