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Cash, Cash Equivalents, Marketable Securities and Restricted Cash (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Cash, Money Market Funds, and Marketable Securities |  |  |  |
Cash and cash equivalents | $ 96,349 | $ 79,749 | $ 114,322 | $ 49,060
Fair value, Available-for-sale debt securities | 341,978 | 424,403 |  |
Fair Value, Cash balances | 96,349 | 79,749 |  |
Cost, available-for-sale securities | 341,821 | 424,830 |  |
Gross unrealized gain, available-for-sale securities | 178 | 11 |  |
Gross unrealized loss, available-for-sale securities | (21) | (438) |  |
Cost, Cash balances and available-for-sale securities | 438,170 | 504,579 |  |
Gross unrealized gain, Cash balances and available-for-sale securities | 178 | 11 |  |
Gross unrealized loss, Cash balances and available-for-sale securities | (21) | (438) |  |
Fair value, Cash balances and available-for-sale securities | 438,327 | 504,152 |  |
Corporate debt securities, current portion |  |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |  |
Fair value, Available-for-sale debt securities | 138,284 | 240,726 |  |
Cost, available-for-sale securities | 138,194 | 240,969 |  |
Gross unrealized gain, available-for-sale securities | 96 | 7 |  |
Gross unrealized loss, available-for-sale securities | (6) | (250) |  |
Commercial paper |  |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |  |
Fair value, Available-for-sale debt securities | 134,993 | 115,141 |  |
Cost, available-for-sale securities | 134,948 | 115,245 |  |
Gross unrealized gain, available-for-sale securities | 52 | 0 |  |
Gross unrealized loss, available-for-sale securities | (7) | (104) |  |
Asset-backed securities |  |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |  |
Fair value, Available-for-sale debt securities | 68,300 | 68,135 |  |
Cost, available-for-sale securities | 68,278 | 68,215 |  |
Gross unrealized gain, available-for-sale securities | 30 | 4 |  |
Gross unrealized loss, available-for-sale securities | (8) | (84) |  |
Money market |  |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |  |
Fair value, Available-for-sale debt securities | 350 | 350 |  |
Cost, available-for-sale securities | 350 | 350 |  |
Gross unrealized gain, available-for-sale securities | 0 | 0 |  |
Gross unrealized loss, available-for-sale securities | 0 | 0 |  |
Certificates of deposit |  |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |  |
Fair value, Available-for-sale debt securities | 51 | 51 |  |
Cost, available-for-sale securities | 51 | 51 |  |
Gross unrealized gain, available-for-sale securities | 0 | 0 |  |
Gross unrealized loss, available-for-sale securities | $ 0 | $ 0 |  |

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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 Cash, Cash Equivalents And Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, Before Tax + 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 marketable securities. + References No definition available. + Details
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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Fair value portion 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. + References No definition available. + Details
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