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Cash, Money Market Funds and Marketable Securities (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Cash, Money Market Funds, and Marketable Securities |  |  |  |
Cash and cash equivalents, Amortized Cost | $ 49,060 | $ 187,026 | $ 69,485 | $ 24,074
Cash and cash equivalents, Fair Value | 49,060 | 187,026 |  |
Marketable securities, Amortized Cost | 309,938 | 143,222 |  |
Gross Unrealized Gain | 1 | 134 |  |
Gross Unrealized Loss | (437) | (31) |  |
Marketable securities, Fair Value | 309,502 | 143,325 |  |
Cash and marketable securities, Amortized Cost | 358,998 | 330,248 |  |
Cash and marketable securities, Fair Value | 358,562 | 330,351 |  |
Available-for-sale investments |  |  |  |
Realized gain (loss) on securities available-for-sale | 0 | 0 |  |
Fair value of available for sale securities in unrealized loss positions | 295,100 | 58,700 |  |
Other current liabilities | Foreign exchange forward contract | Not designated |  |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |  |
Derivative liabilities | 0 | 300 |  |
Other expense | Foreign exchange forward contract | Not designated |  |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |  |
Loss on derivative instruments | 200 | 300 |  |
Corporate debt securities, current portion |  |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |  |
Marketable securities, Amortized Cost | 199,314 | 74,564 |  |
Gross Unrealized Gain | 1 | 2 |  |
Gross Unrealized Loss | (303) | (31) |  |
Marketable securities, Fair Value | 199,012 | 74,535 |  |
Commercial paper |  |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |  |
Marketable securities, Amortized Cost | 79,878 | 68,258 |  |
Gross Unrealized Gain |  | 132 |  |
Gross Unrealized Loss | (75) |  |  |
Marketable securities, Fair Value | 79,803 | 68,390 |  |
Asset-backed securities |  |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |  |
Marketable securities, Amortized Cost | 30,346 |  |  |
Gross Unrealized Loss | (59) |  |  |
Marketable securities, Fair Value | 30,287 |  |  |
Money market funds |  |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |  |
Marketable securities, Amortized Cost | 350 | 350 |  |
Marketable securities, Fair Value | 350 | 350 |  |
Certificate of deposit |  |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |  |
Marketable securities, Amortized Cost | 50 | 50 |  |
Marketable securities, Fair Value | $ 50 | $ 50 |  |

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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Also includes amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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- Definition Represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents cash and cash equivalents and short-term investments. + References No definition available. + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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