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Cash, Cash Equivalents, Marketable Securities and Restricted Cash (Tables) | 6 Months Ended
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Jun. 30, 2019
Cash, Cash Equivalents, and Short-term Investments [Abstract] |
Schedule of cash and available-for-sale securities | Cash, cash equivalents and marketable securities are classified as current unless mentioned otherwise below and consisted of the following:
|  | As of June 30, 2019
(in thousands) |  | Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value
Cash and cash equivalents |  | $ | 220,578 |  |  | $ | — |  |  | $ | — |  |  | $ | 220,578 |
Corporate debt securities |  | 169,425 |  |  | 148 |  |  | (15 | ) |  | 169,558 |
Commercial paper |  | 111,872 |  |  | 156 |  |  | (2 | ) |  | 112,026 |
Asset-backed securities |  | 73,025 |  |  | 68 |  |  | — |  |  | 73,093 |
Money market |  | 350 |  |  | — |  |  | — |  |  | 350 |
Certificates of deposit |  | 51 |  |  | — |  |  | — |  |  | 51 |
|  | $ | 575,301 |  |  | $ | 372 |  |  | $ | (17 | ) |  | $ | 575,656 |
Included in cash and cash equivalents |  | $ | 220,578 |  |  | $ | — |  |  | $ | — |  |  | $ | 220,578 |
Included in marketable securities |  | 354,723 |  |  | 372 |  |  | (17 | ) |  | 355,078 |
Total cash, cash equivalents, and marketable securities |  | $ | 575,301 |  |  | $ | 372 |  |  | $ | (17 | ) |  | $ | 575,656 |
|  | As of December 31, 2018
(in thousands) |  | Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value
Cash and cash equivalents |  | $ | 79,749 |  |  | $ | — |  |  | $ | — |  |  | $ | 79,749 |
Corporate debt securities |  | 240,969 |  |  | 7 |  |  | (250 | ) |  | 240,726 |
Commercial paper |  | 115,245 |  |  | — |  |  | (104 | ) |  | 115,141 |
Asset-backed securities |  | 68,215 |  |  | 4 |  |  | (84 | ) |  | 68,135 |
Money market |  | 350 |  |  | — |  |  | — |  |  | 350 |
Certificates of deposit |  | 51 |  |  | — |  |  | — |  |  | 51 |
|  | $ | 504,579 |  |  | $ | 11 |  |  | $ | (438 | ) |  | $ | 504,152 |
Included in cash and cash equivalents |  | $ | 79,749 |  |  | $ | — |  |  | $ | — |  |  | $ | 79,749 |
Included in marketable securities |  | 424,830 |  |  | 11 |  |  | (438 | ) |  | 424,403 |
Total cash, cash equivalents, and marketable securities |  | $ | 504,579 |  |  | $ | 11 |  |  | $ | (438 | ) |  | $ | 504,152 |
Schedule of restricted cash and cash equivalents | 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, 2019 |  | December 31, 2018 |  | June 30, 2018 |  | December 31, 2017
Cash and cash equivalents |  | $ | 220,578 |  |  | $ | 79,749 |  |  | $ | 73,311 |  |  | $ | 49,060 |
Restricted cash |  | 2,610 |  |  | 2,626 |  |  | 2,130 |  |  | 2,177 |
Cash, cash equivalents, and restricted cash shown in the Consolidated Statements of Cash Flows |  | $ | 223,188 |  |  | $ | 82,375 |  |  | $ | 75,441 |  |  | $ | 51,237 |

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