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Fair Value Measurements (Summary Of Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cost Basis |  |  | $ 412,949 |
Unrealized Gains (Losses) |  |  | (328) |
Fair Value |  |  | 412,621 |
Entach Inc |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Warrants |  |  | 200 | $ 330
Investment impairment charge | $ 2,770 | $ 2,770 |  |
Corporate bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cost Basis |  |  | 745 |
Fair Value |  |  | 743 |
Cash and Cash Equivalents |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  |  | 232,018 |
Short-term Investments and Marketable Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  |  | 180,603 |
Level 1 | Money market funds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cost Basis |  |  | 232,018 |
Unrealized Gains (Losses) |  |  | 0 |
Fair Value |  |  | 232,018 |
Assets, fair value disclosure |  |  |  | $ 485,521
Level 1 | Cash and Cash Equivalents | Money market funds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  |  | 232,018 |
Level 1 | Short-term Investments and Marketable Securities | Money market funds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  |  | $ 0 |
Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Weighted average maturity |  |  | 1 year 3 months 18 days |
Level 2 | Certificates of deposit |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cost Basis |  |  | $ 990 |
Unrealized Gains (Losses) |  |  | 6 |
Fair Value |  |  | 996 |
Level 2 | Commercial paper |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cost Basis |  |  | 1,281 |
Unrealized Gains (Losses) |  |  | 6 |
Fair Value |  |  | 1,287 |
Level 2 | Short-term bond mutual funds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cost Basis |  |  | 100,242 |
Unrealized Gains (Losses) |  |  | (99) |
Fair Value |  |  | 100,143 |
Level 2 | Corporate bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cost Basis |  |  | 78,418 |
Unrealized Gains (Losses) |  |  | (241) |
Fair Value |  |  | 78,177 |
Level 2 | Cash and Cash Equivalents | Certificates of deposit |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  |  | 0 |
Level 2 | Cash and Cash Equivalents | Commercial paper |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  |  | 0 |
Level 2 | Cash and Cash Equivalents | Short-term bond mutual funds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  |  | 0 |
Level 2 | Cash and Cash Equivalents | Corporate bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  |  | 0 |
Level 2 | Short-term Investments and Marketable Securities | Certificates of deposit |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  |  | 996 |
Level 2 | Short-term Investments and Marketable Securities | Commercial paper |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  |  | 1,287 |
Level 2 | Short-term Investments and Marketable Securities | Short-term bond mutual funds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  |  | 100,143 |
Level 2 | Short-term Investments and Marketable Securities | Corporate bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value |  |  | $ 78,177 |

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