Marketable Securities - Schedule of Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Total	$ 135,701	$ 149,680
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Less than 1 Year	7,563
1-5 Years	15,406
5-10 Years	87
Greater than 10 Years	0
Total	23,056	22,155
Government securities - U.S.
Debt Securities, Available-for-sale [Line Items]
Less than 1 Year	4,399
1-5 Years	10,889
5-10 Years	881
Greater than 10 Years	1,684
Total	17,853	18,999
Other fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Less than 1 Year	1,003
1-5 Years	1,352
5-10 Years	705
Greater than 10 Years	0
Total	3,060	$ 3,854
Total
Debt Securities, Available-for-sale [Line Items]
Less than 1 Year	12,965
1-5 Years	27,647
5-10 Years	1,673
Greater than 10 Years	1,684
Total	$ 43,969