Cash, Concentration of Credit Risk and Fair Value of Financial Instruments - Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Assets:
Total	$ 947,459	$ 982,395
Amount included in cash and cash equivalents	528,836	551,547	$ 308,995	$ 442,961
Commercial paper
Assets:
Cash and cash equivalents	73,055	78,870
U.S. government securities
Assets:
Securities	217,899	230,561
Corporate bonds, asset backed and other securities
Assets:
Securities	129,164	137,219
Money market and demand accounts
Assets:
Cash and cash equivalents	527,341	535,745
Commercial paper
Assets:
Amount included in cash and cash equivalents		4,100
Corporate bonds, asset backed and other securities
Assets:
Amount included in cash and cash equivalents	1,000	11,700
Level 1
Assets:
Total	527,341	535,745
Level 1 \| Commercial paper
Assets:
Cash and cash equivalents	0	0
Level 1 \| U.S. government securities
Assets:
Securities	0	0
Level 1 \| Corporate bonds, asset backed and other securities
Assets:
Securities	0	0
Level 1 \| Money market and demand accounts
Assets:
Cash and cash equivalents	527,341	535,745
Level 2
Assets:
Total	420,118	446,650
Level 2 \| Commercial paper
Assets:
Cash and cash equivalents	73,055	78,870
Level 2 \| U.S. government securities
Assets:
Securities	217,899	230,561
Level 2 \| Corporate bonds, asset backed and other securities
Assets:
Securities	129,164	137,219
Level 2 \| Money market and demand accounts
Assets:
Cash and cash equivalents	0	0
Level 3
Assets:
Total	0	0
Level 3 \| Commercial paper
Assets:
Cash and cash equivalents	0	0
Level 3 \| U.S. government securities
Assets:
Securities	0	0
Level 3 \| Corporate bonds, asset backed and other securities
Assets:
Securities	0	0
Level 3 \| Money market and demand accounts
Assets:
Cash and cash equivalents	$ 0	$ 0