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Financial Instruments - Summary of Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Marketable Securities [Line Items]
Debt securities, Cost	$ 118,263	$ 45,782
Debt securities, Gross Unrealized Gains	29	33
Debt securities, Gross Unrealized Losses	(46)	(13)
Debt securities, Allowance for Credit Losses	0
Debt securities, Estimated Fair Values	118,246	45,802
Equity securities, Cost	3,849	6,006
Equity securities, Gross Unrealized Gains	0	0
Equity securities, Gross Unrealized Losses	0	(2,281)
Equity securities, Allowance for Credit Losses	0
Equity securities, Estimated Fair Values	3,849	3,725
Marketable securities, Cost	122,112	51,788
Marketable securities, Gross Unrealized Gains	29	33
Marketable securities, Gross Unrealized Losses	(46)	(2,294)
Marketable securities, Allowance for Credit Losses	0
Marketable securities, Estimated Fair Values	122,095	49,527
Available-for-sale debt securities
Marketable Securities [Line Items]
Marketable securities, Estimated Fair Values	86,947	45,802
Corporate bonds and notes
Marketable Securities [Line Items]
Debt securities, Cost	69,973	41,730
Debt securities, Gross Unrealized Gains	29	29
Debt securities, Gross Unrealized Losses	(42)	(13)
Debt securities, Allowance for Credit Losses	0
Debt securities, Estimated Fair Values	69,960	41,746
Commercial paper
Marketable Securities [Line Items]
Debt securities, Cost	15,991	4,052
Debt securities, Gross Unrealized Gains	0	4
Debt securities, Gross Unrealized Losses	(4)	0
Debt securities, Allowance for Credit Losses	0
Debt securities, Estimated Fair Values	15,987	4,056
Treasury and agency notes and bills
Marketable Securities [Line Items]
Debt securities, Cost	32,299
Debt securities, Gross Unrealized Gains	0
Debt securities, Gross Unrealized Losses	0
Debt securities, Allowance for Credit Losses	0
Debt securities, Estimated Fair Values	32,299
Money market funds
Marketable Securities [Line Items]
Equity securities, Cost	3,849	2,601
Equity securities, Gross Unrealized Gains	0	0
Equity securities, Gross Unrealized Losses	0	0
Equity securities, Allowance for Credit Losses	0
Equity securities, Estimated Fair Values	3,849	2,601
Cash and cash equivalents
Marketable Securities [Line Items]
Marketable securities, Estimated Fair Values	35,148
Marketable equity securities
Marketable Securities [Line Items]
Equity securities, Cost		3,405
Equity securities, Gross Unrealized Gains		0
Equity securities, Gross Unrealized Losses		(2,281)
Equity securities, Estimated Fair Values	$ 0	1,124
Equity securities
Marketable Securities [Line Items]
Marketable securities, Estimated Fair Values		$ 1,124

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