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Fair Value Measurements Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2023
Fair Value Disclosures [Abstract] |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block] | The following table summarizes the levels of fair value measurements of our financial assets:
| December 31, 2023 |  | December 31, 2022
(in thousands) | Total | Level 1 | Level 2 |  | Total | Level 1 | Level 2
Money market funds | $ | 730,508 |  | $ | 730,508 |  | $ | — |  |  | $ | 735,475 |  | $ | 735,475 |  | $ | — |
U.S. Treasury bills | 15,905 |  | 15,905 |  | — |  |  | 29,703 |  | 29,703 |  | — |
Municipal bonds | — |  | — |  | — |  |  | 3,365 |  | — |  | 3,365 |
| 746,413 |  | 746,413 |  | — |  |  | 768,543 |  | 765,178 |  | 3,365 |
Deposits - money market funds | 22,292 |  | 22,292 |  | — |  |  | — |  | — |  | — |
Total | $ | 768,705 |  | $ | 768,705 |  | $ | — |  |  | $ | 768,543 |  | $ | 765,178 |  | $ | 3,365 |
Investments Classified by Contractual Maturity Date [Table Text Block] | As of December 31, 2023, the contractual maturities of all marketable securities in our portfolio were less than one year.
Debt Securities, Available-for-sale | The following is a summary of our available-for-sale marketable securities:
(in thousands) | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Estimated Fair Value
December 31, 2023 |  |  |  |
U.S. Treasury bills | $ | 15,896 |  | $ | 9 |  | $ | — |  | $ | 15,905 |
December 31, 2022 |  |  |  |
U.S. Treasury bills | $ | 29,782 |  | $ | — |  | $ | (79) |  | $ | 29,703 |
Municipal bonds | 3,369 |  | — |  | (4) |  | 3,365 |

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