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Financial Instruments - Summary of Cash and Cash Equivalents, Money Market Funds and Short-term Investments by Significant Investment Category (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | $ 183,958 | $ 263,729
Unrealized Gains | 1 | 15
Unrealized Losses | (202) | (47)
Market Value | 183,757 | 263,697
Level 1 | Money Market Funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 15,329 | 27,686
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Market Value | 15,329 | 27,686
Level 2 | Corporate debt securities included in cash and cash equivalents and short-term investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 163,626 | 118,759
Unrealized Gains | 1 | 1
Unrealized Losses | (202) | (46)
Market Value | 163,425 | 118,714
Level 2 | U.S. Treasury securities included in short-term investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost |  | 63,101
Unrealized Gains |  | 4
Unrealized Losses |  | (1)
Market Value |  | 63,104
Level 2 | U.S. government agency securities included in short-term investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 5,003 | 54,183
Unrealized Gains | 0 | 10
Unrealized Losses | 0 | 0
Market Value | $ 5,003 | $ 54,193

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