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Investments and Fair Value of Financial Instruments - Gains and Losses of Marketable Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 186,489	$ 194,320
Gross Unrealized Gains	553	846
Gross Unrealized Losses	(65)	(4)
Allowance for Credit Loss	0	0
Fair Value	186,977	195,162
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,247	4,242
Gross Unrealized Gains	2	4
Gross Unrealized Losses	0	0
Allowance for Credit Loss	0	0
Fair Value	4,249	4,246
U.S. agency and government sponsored securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,548	7,846
Gross Unrealized Gains	7	11
Gross Unrealized Losses	0	0
Allowance for Credit Loss	0	0
Fair Value	4,555	7,857
U.S. states and municipalities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	47,283	47,934
Gross Unrealized Gains	148	162
Gross Unrealized Losses	(6)	(1)
Allowance for Credit Loss	0	0
Fair Value	47,425	48,095
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	130,411	134,298
Gross Unrealized Gains	396	669
Gross Unrealized Losses	(59)	(3)
Allowance for Credit Loss	0	0
Fair Value	$ 130,748	$ 134,964

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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