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Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2018
Investments All Other Investments [Abstract] |
Cash Equivalents, Restricted Cash and Short-Term Investments Classified as Available-for-sale Securities | Cash equivalents, restricted cash and short-term investments which are classified as available-for-sale securities, consisted of the following (in thousands):
September 30, 2018 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Money market funds (cash equivalents) |  | $ | 22,213 |  |  | $ | — |  |  | $ | — |  |  | $ | 22,213 |
U.S. government agency securities |  |  | 93,246 |  |  |  |  |  |  |  | (23 | ) |  |  | 93,223 |
Agency securities |  |  | 13,649 |  |  |  | — |  |  |  | (1 | ) |  |  | 13,648 |
Restricted cash (money market funds) |  |  | 50 |  |  |  | — |  |  |  | — |  |  |  | 50 |
Total financial assets |  | $ | 129,158 |  |  | $ | — |  |  | $ | (24 | ) |  | $ | 129,134 |
Classified as: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 35,861 |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 93,223 |
Restricted cash (money market funds) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50 |
|  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 129,134 |
December 31, 2017 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Money market funds (cash equivalents) |  | $ | 14,334 |  |  | $ | — |  |  | $ | — |  |  | $ | 14,334 |
U.S. government agency securities |  |  | 16,474 |  |  |  | — |  |  |  | (3 | ) |  |  | 16,471 |
Restricted cash (money market funds) |  |  | 5,330 |  |  |  | 3 |  |  |  | — |  |  |  | 5,333 |
Agency securities |  |  | 1,500 |  |  |  | — |  |  |  | — |  |  |  | 1,500 |
Total financial assets |  | $ | 37,638 |  |  | $ | 3 |  |  | $ | (3 | ) |  | $ | 37,638 |
Classified as: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 14,334 |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,971 |
Restricted cash (money market funds) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,333 |
|  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 37,638 |

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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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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
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Period Type: | duration