Marketable Securities - Schedule of Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Total	$ 145,803	$ 149,680
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Less than 1 Year	5,225
1-5 Years	17,352
5-10 Years	1,014
Greater than 10 Years	0
Total	23,591	22,155
Government securities - U.S.
Debt Securities, Available-for-sale [Line Items]
Less than 1 Year	2,109
1-5 Years	11,440
5-10 Years	1,883
Greater than 10 Years	1,921
Total	17,353	18,999
Other fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Less than 1 Year	1,009
1-5 Years	1,888
5-10 Years	266
Greater than 10 Years	0
Total	3,163	$ 3,854
Total
Debt Securities, Available-for-sale [Line Items]
Less than 1 Year	8,343
1-5 Years	30,680
5-10 Years	3,163
Greater than 10 Years	1,921
Total	$ 44,107