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Cash Equivalents and Marketable Securities | 12 Months Ended
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Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Cash Equivalents and Marketable Securities | CASH EQUIVALENTS AND MARKETABLE SECURITIES The table below summarizes the Company’s cash equivalents and marketable securities (in thousands):
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
December 31, 2020 |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 53,165 |  |  | $ | — |  |  | $ | — |  |  | $ | 53,165 |
Total | 53,165 |  |  | — |  |  | — |  |  | 53,165 |
Marketable securities: |  |  |  |  |  |  |
Commercial paper | 213,500 |  |  | 41 |  |  | (8) |  |  | 213,533 |
Corporate debt securities | 59,575 |  |  | 16 |  |  | (17) |  |  | 59,574 |
Certificates of deposit | 12,311 |  |  | — |  |  | — |  |  | 12,311 |
Asset-backed securities | 17,905 |  |  | 10 |  |  | (7) |  |  | 17,908 |
U.S. government-sponsored entity debt securities | 257,284 |  |  | 19 |  |  | (5) |  |  | 257,298 |
Total | 560,575 |  |  | 86 |  |  | (37) |  |  | 560,624 |
Total cash equivalents and marketable securities | $ | 613,740 |  |  | $ | 86 |  |  | $ | (37) |  |  | $ | 613,789 |
December 31, 2019 |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 30,496 |  |  | $ | — |  |  | $ | — |  |  | $ | 30,496 |
Commercial paper | 2,998 |  |  | 1 |  |  | — |  |  | 2,999 |
Total | 33,494 |  |  | 1 |  |  | — |  |  | 33,495 |
Marketable securities: |  |  |  |  |  |  |
Commercial paper | 155,230 |  |  | 145 |  |  | (7) |  |  | 155,368 |
Corporate debt securities | 94,905 |  |  | 115 |  |  | (3) |  |  | 95,017 |
U.S. government-sponsored entity debt securities | 53,411 |  |  | 91 |  |  | (9) |  |  | 53,493 |
Total | 303,546 |  |  | 351 |  |  | (19) |  |  | 303,878 |
Total cash equivalents and marketable securities | $ | 337,040 |  |  | $ | 352 |  |  | $ | (19) |  |  | $ | 337,373 |
The fair value of marketable securities by contractual maturity were as follows (in thousands):
| December 31,
| 2020 |  | 2019
Maturing in one year or less | $ | 510,094 |  |  | $ | 282,046 |
Maturing after one year through five years | 50,530 |  |  | 21,832 |
Total | $ | 560,624 |  |  | $ | 303,878 |
The Company had no realized losses from the sale of marketable securities for the years ended December 31, 2020, 2019 or 2018. No investments were other-than-temporarily impaired at either December 31, 2020 or 2019. The Company considers factors such as the duration, the magnitude and the reason for the decline in value, the potential recovery period, creditworthiness of the issuers of the securities and its intent to sell. For marketable securities, it also considers whether (i) it is more likely than not that the Company will be required to sell the debt securities before recovery of their amortized cost basis, and (ii) the amortized cost basis cannot be recovered as a result of credit losses. No significant facts or circumstances have arisen to indicate that there has been any significant deterioration in the creditworthiness of the issuers of the securities held by the Company. Based on the Company’s review of these securities, including the assessment of the duration and severity of the unrealized losses and the Company’s ability and intent to hold the investments until maturity, there were no other-than-temporary impairments for these marketable securities at December 31, 2020.

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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 + Details
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