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Cash, Cash Equivalents, Marketable Securities and Restricted Cash (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, 2019
(in thousands) | Cost |  | Gross unrealized Gain |  | Gross unrealized Loss |  | Fair Value
Cash and cash equivalents | $ | 96,349 |  |  | $ | — |  |  | $ | — |  |  | $ | 96,349 |
Corporate debt securities, current portion | 138,194 |  |  | 96 |  |  | (6 | ) |  | 138,284 |
Commercial paper | 134,948 |  |  | 52 |  |  | (7 | ) |  | 134,993 |
Asset-backed securities | 68,278 |  |  | 30 |  |  | (8 | ) |  | 68,300 |
Money market | 350 |  |  | — |  |  | — |  |  | 350 |
Certificates of deposit | 51 |  |  | — |  |  | — |  |  | 51 |
| $ | 438,170 |  |  | $ | 178 |  |  | $ | (21 | ) |  | $ | 438,327 |
Included in cash and cash equivalents | $ | 96,349 |  |  | $ | — |  |  | $ | — |  |  | $ | 96,349 |
Included in marketable securities, current and non-current | 341,821 |  |  | 178 |  |  | (21 | ) |  | 341,978 |
Total cash, cash equivalents and marketable securities | $ | 438,170 |  |  | $ | 178 |  |  | $ | (21 | ) |  | $ | 438,327 |
| 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, current portion | 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 and cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the Company's consolidated statements of cash flows.
(in thousands) | March 31, 2019 |  | December 31, 2018 |  | March 31, 2018 |  | December 31, 2017
Cash and cash equivalents | $ | 96,349 |  |  | $ | 79,749 |  |  | $ | 114,322 |  |  | $ | 49,060 |
Restricted cash | 2,579 |  |  | 2,626 |  |  | 2,230 |  |  | 2,177 |
Cash and cash equivalents and restricted cash shown in the statement of cash flows | $ | 98,928 |  |  | $ | 82,375 |  |  | $ | 116,552 |  |  | $ | 51,237 |

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