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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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