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Cash Equivalents and Marketable Securities - Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Cash Equivalents and Marketable Securities
Total cash equivalents and marketable securities, Amortized Cost	$ 348,019	$ 304,142
Total cash equivalents and marketable securities, Gross Unrealized Gains	6	12
Total cash equivalents and marketable securities, Gross Unrealized Losses	(29)	(10)
Total cash equivalents and marketable securities, Fair Value	347,996	304,144
U.S. Treasury and agency securities
Cash Equivalents and Marketable Securities
Total cash equivalents and marketable securities, Amortized Cost	42,186	183,203
Total cash equivalents and marketable securities, Gross Unrealized Gains	3	10
Total cash equivalents and marketable securities, Gross Unrealized Losses	(2)	(3)
Total cash equivalents and marketable securities, Fair Value	42,187	183,210
Corporate debt securities
Cash Equivalents and Marketable Securities
Total cash equivalents and marketable securities, Amortized Cost	81,413	27,592
Total cash equivalents and marketable securities, Gross Unrealized Gains	1	2
Total cash equivalents and marketable securities, Gross Unrealized Losses	(22)	(4)
Total cash equivalents and marketable securities, Fair Value	81,392	27,590
Supranational and sovereign government securities
Cash Equivalents and Marketable Securities
Total cash equivalents and marketable securities, Amortized Cost	6,028
Total cash equivalents and marketable securities, Fair Value	6,028
Money Market Funds
Cash Equivalents and Marketable Securities
Total cash equivalents and marketable securities, Amortized Cost	57,077	27,481
Total cash equivalents and marketable securities, Fair Value	57,077	27,481
Commercial Paper
Cash Equivalents and Marketable Securities
Total cash equivalents and marketable securities, Amortized Cost	161,315	65,866
Total cash equivalents and marketable securities, Gross Unrealized Gains	2
Total cash equivalents and marketable securities, Gross Unrealized Losses	(5)	(3)
Total cash equivalents and marketable securities, Fair Value	$ 161,312	$ 65,863

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This item represents the cost of debt and equity securities, including cash equivalents which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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The aggregate fair value of amount of investment in debt and equity securities and cash equivalents categorized neither as held-to-maturity nor trading.

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Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as cash equivalents and marketable securities.

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Amount of unrealized loss before deducting unrealized gain on investments in cash equivalents and marketable securities.

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