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Cash and Cash Equivalents and Investments | 9 Months Ended
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Sep. 30, 2018
Cash and Cash Equivalents and Investments [Abstract] |
Cash and Cash Equivalents Disclosure | Cash and Cash Equivalents and Investments The fair value of cash and cash equivalents and investments held at September 30, 2018 and December 31, 2017 are as follows:
|  | As of September 30, 2018
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
|  | (in thousands)
Cash and cash equivalents |  | $ | 48,902 |  |  | $ | — |  |  | $ | — |  |  | $ | 48,902 |
Securities maturing within one year: |  |  |  |  |  |  |  |
U.S. treasury securities |  | 125,651 |  |  | — |  |  | (63 | ) |  | 125,588 |
Corporate debt securities |  | 12,815 |  |  | — |  |  | (8 | ) |  | 12,807 |
Total short-term investments |  | $ | 138,466 |  |  | $ | — |  |  | $ | (71 | ) |  | $ | 138,395 |
Total cash and cash equivalents and investments |  | $ | 187,368 |  |  | $ | — |  |  | $ | (71 | ) |  | $ | 187,297 |
|  | As of December 31, 2017
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
|  |  |  | (in thousands) |  |
Cash and cash equivalents |  | $ | 61,661 |  |  | $ | — |  |  | $ | — |  |  | $ | 61,661 |
Securities maturing within one year: |  |  |  |  |  |  |  |
U.S. treasury securities |  | 222,316 |  |  | — |  |  | (168 | ) |  | 222,148 |
Corporate debt securities |  | 27,033 |  |  | — |  |  | (54 | ) |  | 26,979 |
Total short-term investments |  | $ | 249,349 |  |  | $ | — |  |  | $ | (222 | ) |  | $ | 249,127 |
Total cash and cash equivalents and investments |  | $ | 311,010 |  |  | $ | — |  |  | $ | (222 | ) |  | $ | 310,788 |
There were no realized losses for the nine months ended September 30, 2018, and $7,000 in realized losses for the nine months ended September 30, 2017. The cost of securities sold is based on the specific identification method.

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- Definition Cash and Cash Equivalents and Investments [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for cash and cash equivalent footnotes, which may include the types of deposits and money market instruments, applicable carrying amounts, restricted amounts and compensating balance arrangements. Cash and equivalents include: (1) currency on hand (2) demand deposits with banks or financial institutions (3) other kinds of accounts that have the general characteristics of demand deposits (4) short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments maturing within three months from the date of acquisition qualify. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -URI http://asc.fasb.org/topic&trid=2122426 + Details
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