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Cash and Marketable Securities | 3 Months Ended
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Mar. 31, 2021
Cash and Cash Equivalents [Abstract] |
Cash and Marketable Securities | CASH AND MARKETABLE SECURITIES Cash, Cash Equivalents and Restricted Cash 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 |
Marketable Securities All marketable securities were considered held-to-maturity at March 31, 2021 and December 31, 2020. As of March 31, 2021 and December 31, 2020, some of the Company’s marketable securities were in an unrealized loss position. The Company determined that it had the positive intent and ability to hold until maturity all marketable securities that have been in a continuous loss position, thus there was no recognition of any other-than-temporary impairment as of March 31, 2021 and December 31, 2020. All marketable securities with unrealized losses as of each balance sheet date have been in a loss position for less than twelve months. 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 |
Contractual maturities of the short-term marketable securities all mature within one year as of March 31, 2021.

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- Definition The entire disclosure for cash and cash equivalent footnotes, which may include the types of deposits and money market instruments, applicable carrying amounts, restricted amounts and compensating balance arrangements. Cash and equivalents include: (1) currency on hand (2) demand deposits with banks or financial institutions (3) other kinds of accounts that have the general characteristics of demand deposits (4) short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments maturing within three months from the date of acquisition qualify. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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