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Cash, Cash Equivalents, Marketable Securities, and Restricted Cash (Tables) | 6 Months Ended
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Jun. 30, 2020
Cash, Cash Equivalents, and Short-term Investments [Abstract] |
Schedule of cash, cash equivalents and marketable securities | Cash, cash equivalents and marketable securities are classified as current unless mentioned otherwise below and consisted of the following:
|  | As of June 30, 2020 |  |  |  |  |  |
(in thousands) |  | Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value
Cash and cash equivalents |  | $ | 164,573 |  |  | $ | — |  |  | $ | — |  |  | $ | 164,573 |
Corporate debt securities |  | 51,307 |  |  | 225 |  |  | — |  |  | 51,532 |
Commercial paper |  | 59,803 |  |  | 103 |  |  | (4) |  |  | 59,902 |
Asset-backed securities |  | 33,020 |  |  | 162 |  |  | — |  |  | 33,182 |
Money market |  | 350 |  |  | — |  |  | — |  |  | 350 |
Certificates of deposit |  | 51 |  |  | — |  |  | — |  |  | 51 |
|  | $ | 309,104 |  |  | $ | 490 |  |  | $ | (4) |  |  | $ | 309,590 |
Included in cash and cash equivalents |  | $ | 164,573 |  |  | $ | — |  |  | $ | — |  |  | $ | 164,573 |
Included in marketable securities |  | 144,531 |  |  | 490 |  |  | (4) |  |  | 145,017 |
Total cash, cash equivalents, and marketable securities |  | $ | 309,104 |  |  | $ | 490 |  |  | $ | (4) |  |  | $ | 309,590 |
|  | As of December 31, 2019 |  |  |  |  |  |
(in thousands) |  | Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value
Cash and cash equivalents |  | $ | 142,837 |  |  | $ | — |  |  | $ | — |  |  | $ | 142,837 |
Corporate debt securities |  | 145,875 |  |  | 121 |  |  | (5) |  |  | 145,991 |
Commercial paper |  | 73,659 |  |  | 53 |  |  | (2) |  |  | 73,710 |
Asset-backed securities |  | 77,731 |  |  | 79 |  |  | — |  |  | 77,810 |
U.S. government agency bonds |  | 11,999 |  |  | 2 |  |  | (10) |  |  | 11,991 |
Money market |  | 350 |  |  | — |  |  | — |  |  | 350 |
Certificates of deposit |  | 51 |  |  | — |  |  | — |  |  | 51 |
|  | $ | 452,502 |  |  | $ | 255 |  |  | $ | (17) |  |  | $ | 452,740 |
Included in cash and cash equivalents |  | $ | 142,837 |  |  | $ | — |  |  | $ | — |  |  | $ | 142,837 |
Included in marketable securities(1) |  | 309,665 |  |  | 255 |  |  | (17) |  |  | 309,903
Total cash, cash equivalents, and marketable securities |  | $ | 452,502 |  |  | $ | 255 |  |  | $ | (17) |  |  | $ | 452,740 |
______________________________ (1) As of December 31, 2019, $9.5 million of marketable securities have maturity dates greater than 12 months and are available to convert into cash, if needed.
Schedule of cash, cash equivalents, and restricted cash | The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the Consolidated Balance Sheets that sum to the total of the same such amounts shown in the Consolidated Statements of Cash Flows.
(in thousands) |  | June 30, 2020 |  | June 30, 2019
Cash and cash equivalents |  | $ | 164,573 |  |  | $ | 220,578 |
Restricted cash |  | 2,689 |  |  | 2,610 |
Cash, cash equivalents, and restricted cash shown in the Consolidated Statements of Cash Flows |  | $ | 167,262 |  |  | $ | 223,188 |

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