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Cash and Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2021
Cash and Cash Equivalents [Abstract] |
Schedule of Cash and Cash Equivalents | A reconciliation of cash, cash equivalents, and restricted cash reported within the condensed consolidated balance sheets to the amount reported within the condensed consolidated statements of cash flows is shown in the table below (in thousands):
| March 31, 2021 |  | December 31, 2020 |  | March 31, 2020 |  | December 31, 2019
Cash and cash equivalents | $ | 309,324 |  |  | $ | 134,669 |  |  | $ | 32,191 |  |  | $ | 38,223 |
Restricted cash | 269 |  |  | 270 |  |  | 242 |  |  | 256 |
Total cash, cash equivalents, and restricted cash at the end of the period | $ | 309,593 |  |  | $ | 134,939 |  |  | $ | 32,433 |  |  | $ | 38,479 |
Debt Securities, Held-to-maturity | The amortized cost, gross unrealized holding losses, and fair value of the Company’s marketable securities by major security type at each balance sheet date are summarized in the table below (in thousands):
| March 31, 2021
| Amortized Cost |  | Unrealized Holding Losses |  | Fair Value
Short-term marketable securities: |  |  |  |  |
Corporate debt securities | $ | 64,963 |  |  | $ | (66) |  |  | $ | 64,897 |
Total short-term marketable securities | $ | 64,963 |  |  | $ | (66) |  |  | $ | 64,897 |
| December 31, 2020
| Amortized Cost |  | Unrealized Holding Losses |  | Fair Value
Short-term marketable securities: |  |  |  |  |
Corporate debt securities | $ | 90,034 |  |  | $ | (136) |  |  | $ | 89,898 |
Total short-term marketable securities | $ | 90,034 |  |  | $ | (136) |  |  | $ | 89,898 |

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- Definition Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5B -URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269825-111563 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 + Details
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- Definition Tabular disclosure of the components of cash and cash equivalents. + References No definition available. + Details
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