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Cash, Cash Equivalents, Marketable Securities, and Restricted Cash - Components (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Cash, Money Market Funds, and Marketable Securities
Cash and cash equivalents	$ 176,538	$ 163,240	$ 164,573
Fair value, cash balances	176,538	163,240
Cost, available-for-sale securities	206,505	320,016
Gross unrealized gain, available-for-sale securities	29	39
Gross unrealized loss, available-for-sale securities	(4)	(26)
Fair value, available-for-sale debt securities	206,530	320,029
Cost, cash balances and available-for-sale securities	383,043	483,256
Gross unrealized gain, cash balances and available-for-sale securities	29	39
Gross unrealized loss, cash balances and available-for-sale securities	(4)	(26)
Fair value, cash balances and available-for-sale securities	383,068	483,269
Corporate debt securities
Cash, Money Market Funds, and Marketable Securities
Corporate debt securities, cost	12,039	39,525
Corporate debt securities, gross unrealized gain	0	4
Corporate debt securities, gross unrealized loss	0	(16)
Corporate debt securities, fair value	12,039	39,513
Commercial paper
Cash, Money Market Funds, and Marketable Securities
Cost, available-for-sale securities	147,317	217,087
Gross unrealized gain, available-for-sale securities	22	14
Gross unrealized loss, available-for-sale securities	0	(6)
Fair value, available-for-sale debt securities	147,339	217,095
Asset-backed securities
Cash, Money Market Funds, and Marketable Securities
Corporate debt securities, cost	20,681	9,420
Corporate debt securities, gross unrealized gain	3	18
Corporate debt securities, gross unrealized loss	(4)	0
Corporate debt securities, fair value	20,680	9,438
U.S. government agency bonds
Cash, Money Market Funds, and Marketable Securities
Corporate debt securities, cost	26,067	53,583
Corporate debt securities, gross unrealized gain	4	3
Corporate debt securities, gross unrealized loss	0	(4)
Corporate debt securities, fair value	26,071	53,582
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.

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