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Cash and Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract] |
Schedule of Cash and Cash Equivalents | A reconciliation of cash, cash equivalents and restricted cash reported within the Condensed Consolidated Balance Sheets to the amounts reported within the accompanying Condensed Consolidated Statements of Cash Flows was as follows (in thousands):
| June 30, 2019 |  | December 31, 2018 |  | June 30, 2018 |  | December 31, 2017
Cash and cash equivalents | $ | 169,222 |  |  | $ | 140,418 |  |  | $ | 59,406 |  |  | $ | 49,826 |
Restricted cash included in Restricted cash, current portion | 2,000 |  |  | — |  |  | — |  |  | — |
Restricted cash included in Non-current restricted cash | 1,500 |  |  | 3,500 |  |  | 3,500 |  |  | 3,500 |
Cash, cash equivalents and restricted cash as reported within the accompanying Condensed Consolidated Statements of Cash Flows | $ | 172,722 |  |  | $ | 143,918 |  |  | $ | 62,906 |  |  | $ | 53,326 |
Restrictions on Cash and Cash Equivalents | A reconciliation of cash, cash equivalents and restricted cash reported within the Condensed Consolidated Balance Sheets to the amounts reported within the accompanying Condensed Consolidated Statements of Cash Flows was as follows (in thousands):
| June 30, 2019 |  | December 31, 2018 |  | June 30, 2018 |  | December 31, 2017
Cash and cash equivalents | $ | 169,222 |  |  | $ | 140,418 |  |  | $ | 59,406 |  |  | $ | 49,826 |
Restricted cash included in Restricted cash, current portion | 2,000 |  |  | — |  |  | — |  |  | — |
Restricted cash included in Non-current restricted cash | 1,500 |  |  | 3,500 |  |  | 3,500 |  |  | 3,500 |
Cash, cash equivalents and restricted cash as reported within the accompanying Condensed Consolidated Statements of Cash Flows | $ | 172,722 |  |  | $ | 143,918 |  |  | $ | 62,906 |  |  | $ | 53,326 |
Marketable Securities | The table below summarizes the Company’s cash equivalents and available-for-sale securities (in thousands):
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Estimated Fair Value
June 30, 2019 |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |
Money market funds |  | $ | 71,490 |  |  | $ | — |  |  | $ | — |  |  | $ | 71,490 |
Commercial paper securities |  | 30,439 |  |  | 2 |  |  | — |  |  | 30,441 |
Total |  | 101,929 |  |  | 2 |  |  | — |  |  | 101,931 |
Available-for-sale securities: |  |  |  |  |  |  |  |
Commercial paper securities |  | 170,598 |  |  | 355 |  |  | — |  |  | 170,953 |
Corporate debt securities |  | 71,280 |  |  | 108 |  |  | (5 | ) |  | 71,383 |
U.S. government-sponsored entity debt securities |  | 37,973 |  |  | 18 |  |  | — |  |  | 37,991 |
Total |  | 279,851 |  |  | 481 |  |  | (5 | ) |  | 280,327 |
Total cash equivalents and available-for-sale securities |  | $ | 381,780 |  |  | $ | 483 |  |  | $ | (5 | ) |  | $ | 382,258 |
December 31, 2018 |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |
Money market funds |  | $ | 103,291 |  |  | $ | — |  |  | $ | — |  |  | $ | 103,291 |
Total |  | 103,291 |  |  | — |  |  | — |  |  | 103,291 |
Available-for-sale securities: |  |  |  |  |  |  |  |
Commercial paper securities |  | 177,353 |  |  | — |  |  | (129 | ) |  | 177,224 |
Corporate debt securities |  | 63,981 |  |  | — |  |  | (111 | ) |  | 63,870 |
U.S. government-sponsored entity debt securities |  | 18,640 |  |  | — |  |  | (19 | ) |  | 18,621 |
Total |  | 259,974 |  |  | — |  |  | (259 | ) |  | 259,715 |
Total cash equivalents and available-for-sale securities |  | $ | 363,265 |  |  | $ | — |  |  | $ | (259 | ) |  | $ | 363,006 |
Fair value of investments available-for-sale | The fair value of investments available-for-sale by contractual maturity were as follows (in thousands):
|  | June 30, 2019 |  | December 31, 2018
Maturing in one year or less |  | $ | 271,877 |  |  | $ | 259,715 |
Maturing after one year through five years |  | 8,450 |  |  | — |
Total |  | $ | 280,327 |  |  | $ | 259,715 |

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