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Cash, Cash Equivalents, Restricted Cash and Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2018
Cash Cash Equivalents And Short Term Investments [Abstract] |
Reconciliation of Cash, Cash Equivalents and Restricted Cash | The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the condensed consolidated balance sheet that sum to the total of the same amounts shown in the condensed consolidated statements of cash flows:
|  | June 30, 2018 |  |  | December 31, 2017 |
Cash and cash equivalents |  | $ | 28,726 |  |  | $ | 26,584 |
Restricted cash |  |  | 624 |  |  |  | 629 |
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows |  | $ | 29,350 |  |  | $ | 27,213 |
Due to the adoption of ASU 2016-18, we have presented below, comparable prior period cash, cash equivalents and restricted cash balances as presented in the condensed consolidated statement of cash flows:
|  | June 30, 2017 |  |  | December 31, 2016 |
Cash and cash equivalents |  | $ | 37,675 |  |  | $ | 24,289 |
Restricted cash |  |  | 619 |  |  |  | 602 |
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows |  | $ | 38,294 |  |  | $ | 24,891 |
Summary of Cash, Cash Equivalents and Marketable Securities | Cash, cash equivalents and marketable securities consist of the following (in thousands):
| Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
June 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 3,313 |  |  | $ | - |  |  | $ | - |  |  | $ | 3,313 |
Money market funds |  | 25,413 |  |  |  | - |  |  |  | - |  |  |  | 25,413 |
Total cash and cash equivalents |  | 28,726 |  |  |  | - |  |  |  | - |  |  |  | 28,726 |
Marketable securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  | 37,131 |  |  |  | - |  |  |  | (12 | ) |  |  | 37,119 |
U.S. government agency securities |  | 45,230 |  |  |  | - |  |  |  | (52 | ) |  |  | 45,178 |
Corporate debt securities |  | 105,040 |  |  |  | 7 |  |  |  | (27 | ) |  |  | 105,020 |
Total marketable securities available-for-sale |  | 187,401 |  |  |  | 7 |  |  |  | (91 | ) |  |  | 187,317 |
Total cash, cash equivalents and marketable securities | $ | 216,127 |  |  | $ | 7 |  |  | $ | (91 | ) |  | $ | 216,043 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 4,041 |  |  | $ | - |  |  | $ | - |  |  | $ | 4,041 |
Money market funds |  | 22,543 |  |  |  | - |  |  |  | - |  |  |  | 22,543 |
Total cash and cash equivalents |  | 26,584 |  |  |  | - |  |  |  | - |  |  |  | 26,584 |
Marketable securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  | 45,559 |  |  |  | - |  |  |  | (25 | ) |  |  | 45,534 |
U.S. government agency securities |  | 86,860 |  |  |  | - |  |  |  | (40 | ) |  |  | 86,820 |
Corporate debt securities |  | 32,931 |  |  |  | - |  |  |  | (15 | ) |  |  | 32,916 |
Total marketable securities available-for-sale |  | 165,350 |  |  |  | - |  |  |  | (80 | ) |  |  | 165,270 |
Total cash, cash equivalents and marketable securities | $ | 191,934 |  |  | $ | - |  |  | $ | (80 | ) |  | $ | 191,854 |
Maturities of Marketable Securities Available-for-Sale | The maturities of our marketable securities available-for-sale are as follows (in thousands):
|  | June 30, 2018 |
|  | Amortized Cost |  |  | Estimated Fair Value |
Mature in one year or less |  | $ | 187,401 |  |  | $ | 187,317 |
Mature after one year through two years |  |  | - |  |  |  | - |
|  | $ | 187,401 |  |  | $ | 187,317 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
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