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Cash, Cash Equivalents, Marketable Securities, and Restricted Cash - Components (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Cash, Money Market Funds, and Marketable Securities
Cash and cash equivalents	$ 233,317	$ 245,197	$ 184,833
Fair value, cash balances	233,317	245,197
Cost, available-for-sale securities	178,288	237,371
Gross unrealized gain, available-for-sale securities	0	7
Gross unrealized loss, available-for-sale securities	(410)	(79)
Fair value, available-for-sale debt securities	177,878	237,299
Cost, cash balances and available-for-sale securities	411,605	482,568
Gross unrealized gain, cash balances and available-for-sale securities	0	7
Gross unrealized loss, cash balances and available-for-sale securities	(410)	(79)
Fair value, cash balances and available-for-sale securities	411,195	482,496
Commercial paper
Cash, Money Market Funds, and Marketable Securities
Corporate debt securities, cost	132,131
Corporate debt securities, gross unrealized gain	0
Corporate debt securities, gross unrealized loss	(311)
Corporate debt securities, fair value	131,820
Cost, available-for-sale securities		174,578
Gross unrealized gain, available-for-sale securities		7
Gross unrealized loss, available-for-sale securities		(54)
Fair value, available-for-sale debt securities		174,531
U.S. government agency bonds
Cash, Money Market Funds, and Marketable Securities
Cost, available-for-sale securities	35,229
Gross unrealized gain, available-for-sale securities	0
Gross unrealized loss, available-for-sale securities	(78)
Fair value, available-for-sale debt securities	35,151
Asset-backed securities
Cash, Money Market Funds, and Marketable Securities
Corporate debt securities, cost	6,013	30,070
Corporate debt securities, gross unrealized gain	0	0
Corporate debt securities, gross unrealized loss	(15)	(14)
Corporate debt securities, fair value	5,998	30,056
Corporate debt securities
Cash, Money Market Funds, and Marketable Securities
Corporate debt securities, cost	4,514	32,322
Corporate debt securities, gross unrealized gain	0	0
Corporate debt securities, gross unrealized loss	(6)	(11)
Corporate debt securities, fair value	4,508	32,311
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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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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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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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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