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Cash, Cash Equivalents, Marketable Securities, and Restricted Cash - Components (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Cash, Money Market Funds, and Marketable Securities
Cash and cash equivalents	$ 123,231	$ 142,837	$ 96,349
Fair Value, Cash balances	123,231	142,837
Cost, available-for-sale securities	215,613	309,665
Gross unrealized gain, available-for-sale securities	190	255
Gross unrealized loss, available-for-sale securities	(161)	(17)
Fair value, Available-for-sale debt securities	215,642	309,903
Cost, Cash balances and available-for-sale securities	338,844	452,502
Gross unrealized gain, Cash balances and available-for-sale securities	190	255
Gross unrealized loss, Cash balances and available-for-sale securities	(161)	(17)
Fair value, Cash balances and available-for-sale securities	338,873	452,740
Marketable securities with maturity date greater than 12 months		9,500
Corporate debt securities
Cash, Money Market Funds, and Marketable Securities
Corporate debt securities, Cost	107,152	145,875
Corporate debt securities, Gross Unrealized Gain	65	121
Corporate debt securities, Gross Unrealized Loss	(119)	(5)
Corporate debt securities, Fair Value	107,098	145,991
Commercial paper
Cash, Money Market Funds, and Marketable Securities
Cost, available-for-sale securities	35,248	73,659
Gross unrealized gain, available-for-sale securities	100	53
Gross unrealized loss, available-for-sale securities	0	(2)
Fair value, Available-for-sale debt securities	35,348	73,710
Asset-backed securities
Cash, Money Market Funds, and Marketable Securities
Corporate debt securities, Cost	68,812	77,731
Corporate debt securities, Gross Unrealized Gain	25	79
Corporate debt securities, Gross Unrealized Loss	(42)	0
Corporate debt securities, Fair Value	68,795	77,810
U.S. government agency bonds
Cash, Money Market Funds, and Marketable Securities
Corporate debt securities, Cost	4,000	11,999
Corporate debt securities, Gross Unrealized Gain	0	2
Corporate debt securities, Gross Unrealized Loss	0	(10)
Corporate debt securities, Fair Value	4,000	11,991
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).

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

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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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