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Marketable Securities - Schedule of Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Total	$ 122,924	$ 149,680
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Less than 1 Year	4,733
1-5 Years	14,012
5-10 Years	326
Greater than 10 Years	0
Total	19,071	22,155
Government securities - U.S.
Debt Securities, Available-for-sale [Line Items]
Less than 1 Year	369
1-5 Years	10,915
5-10 Years	884
Greater than 10 Years	1,294
Total	13,462	18,999
Other fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Less than 1 Year	0
1-5 Years	1,170
5-10 Years	653
Greater than 10 Years	0
Total	1,823	$ 3,854
Total
Debt Securities, Available-for-sale [Line Items]
Less than 1 Year	5,102
1-5 Years	26,097
5-10 Years	1,863
Greater than 10 Years	1,294
Total	$ 34,356

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