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Cash, Cash Equivalents, Marketable Securities and Restricted Cash - Components (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Cash, Money Market Funds, and Marketable Securities
Cash and cash equivalents	$ 166,319	$ 79,749	$ 201,827	$ 49,060
Fair Value, Cash balances	166,319	79,749
Cost, available-for-sale securities	347,554	424,830
Gross unrealized gain, available-for-sale securities	346	11
Gross unrealized loss, available-for-sale securities	(25)	(438)
Fair value, Available-for-sale debt securities	347,875	424,403
Cost, Cash balances and available-for-sale securities	513,873	504,579
Gross unrealized gain, Cash balances and available-for-sale securities	346	11
Gross unrealized loss, Cash balances and available-for-sale securities	(25)	(438)
Fair value, Cash balances and available-for-sale securities	514,194	504,152
Marketable securities with maturity date greater than 12 months	27,500
Corporate debt securities
Cash, Money Market Funds, and Marketable Securities
Corporate debt securities, Cost	139,591	240,969
Corporate debt securities, Gross Unrealized Gain	158	7
Corporate debt securities, Gross Unrealized Loss	(4)	(250)
Corporate debt securities, Fair Value	139,745	240,726
Commercial paper
Cash, Money Market Funds, and Marketable Securities
Cost, available-for-sale securities	114,713	115,245
Gross unrealized gain, available-for-sale securities	95	0
Gross unrealized loss, available-for-sale securities	0	(104)
Fair value, Available-for-sale debt securities	114,808	115,141
Asset-backed securities
Cash, Money Market Funds, and Marketable Securities
Corporate debt securities, Cost	75,166	68,215
Corporate debt securities, Gross Unrealized Gain	93	4
Corporate debt securities, Gross Unrealized Loss	(4)	(84)
Corporate debt securities, Fair Value	75,255	68,135
U.S. government agency bonds
Cash, Money Market Funds, and Marketable Securities
Corporate debt securities, Cost	17,683
Corporate debt securities, Gross Unrealized Gain	0
Corporate debt securities, Gross Unrealized Loss	(17)
Corporate debt securities, Fair Value	17,666
Money market
Cash, Money Market Funds, and Marketable Securities
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
Fair value, Available-for-sale debt securities	350	350
Certificates of deposit
Cash, Money Market Funds, and Marketable Securities
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
Fair value, Available-for-sale debt securities	$ 51	$ 51

X

- 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

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Cash, Cash Equivalents And Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, Before Tax

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Cash, Cash Equivalents And Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, Before Tax

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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.

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Debt Securities, Available-For-Sale, Accumulated Gross Unrealized Gain, Before Tax, Current

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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).

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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).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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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.

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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.

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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