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Fair Value Measurements - Unrealized Losses and Fair Values of Available-for-Sale Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Gross Unrealized Losses |  |
Securities in Unrealized Loss Position Less than 12 months | $ 1,919 | $ 1,724
Securities in Unrealized Loss Position Greater than 12 months | 470 | 170
Total | 2,389 | 1,894
Fair Market Value |  |
Securities in Unrealized Loss Position Less than 12 months | 260,579 | 257,858
Securities in Unrealized Loss Position Greater than 12 months | 24,685 | 16,111
Total | 285,264 | 273,969
U.S. treasury securities |  |
Gross Unrealized Losses |  |
Securities in Unrealized Loss Position Less than 12 months | 467 | 774
Securities in Unrealized Loss Position Greater than 12 months | 381 | 0
Total | 848 | 774
Fair Market Value |  |
Securities in Unrealized Loss Position Less than 12 months | 40,628 | 49,114
Securities in Unrealized Loss Position Greater than 12 months | 19,412 | 0
Total | 60,040 | 49,114
Commercial paper |  |
Gross Unrealized Losses |  |
Securities in Unrealized Loss Position Less than 12 months | 47 | 266
Securities in Unrealized Loss Position Greater than 12 months | 0 | 0
Total | 47 | 266
Fair Market Value |  |
Securities in Unrealized Loss Position Less than 12 months | 98,409 | 151,354
Securities in Unrealized Loss Position Greater than 12 months | 0 | 0
Total | 98,409 | 151,354
Corporate debt securities |  |
Gross Unrealized Losses |  |
Securities in Unrealized Loss Position Less than 12 months | 49 | 14
Securities in Unrealized Loss Position Greater than 12 months | 0 | 57
Total | 49 | 71
Fair Market Value |  |
Securities in Unrealized Loss Position Less than 12 months | 6,862 | 6,859
Securities in Unrealized Loss Position Greater than 12 months | 0 | 7,224
Total | 6,862 | 14,083
Agency securities |  |
Gross Unrealized Losses |  |
Securities in Unrealized Loss Position Less than 12 months | 1,356 | 670
Securities in Unrealized Loss Position Greater than 12 months | 89 | 113
Total | 1,445 | 783
Fair Market Value |  |
Securities in Unrealized Loss Position Less than 12 months | 114,680 | 50,531
Securities in Unrealized Loss Position Greater than 12 months | 5,273 | 8,887
Total | $ 119,953 | $ 59,418

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