Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Details) - Fair Value Measurements Recurring - USD ($) |
Mar. 31, 2022 |
Dec. 31, 2021 |
---|---|---|
Assets: | ||
Total | $ 229,300,000 | $ 265,750,000 |
Level 1 | ||
Assets: | ||
Total | 113,133,000 | 114,052,000 |
Level 2 | ||
Assets: | ||
Total | 116,167,000 | 151,698,000 |
Level 3 | ||
Assets: | ||
Total | 0 | 0 |
Money Market Funds | ||
Assets: | ||
Total | 28,358,000 | 29,451,000 |
Money Market Funds | Level 1 | ||
Assets: | ||
Total | 28,358,000 | 29,451,000 |
Commercial Paper | ||
Assets: | ||
Total | 25,179,000 | 22,580,000 |
Commercial Paper | Level 2 | ||
Assets: | ||
Total | 25,179,000 | 22,580,000 |
Corporate Debt Securities | ||
Assets: | ||
Total | 49,511,000 | 74,861,000 |
Corporate Debt Securities | Level 2 | ||
Assets: | ||
Total | 49,511,000 | 74,861,000 |
Equity Securities | ||
Assets: | ||
Total | 37,744,000 | 37,181,000 |
Equity Securities | Level 1 | ||
Assets: | ||
Total | 37,744,000 | 37,181,000 |
Asset-backed Securities | ||
Assets: | ||
Total | 20,398,000 | 32,957,000 |
Asset-backed Securities | Level 2 | ||
Assets: | ||
Total | 20,398,000 | 32,957,000 |
U.S. Government Securities | ||
Assets: | ||
Total | 47,031,000 | 47,420,000 |
U.S. Government Securities | Level 1 | ||
Assets: | ||
Total | 47,031,000 | 47,420,000 |
Supranational Debt Securities | ||
Assets: | ||
Total | 21,079,000 | 21,300,000 |
Supranational Debt Securities | Level 2 | ||
Assets: | ||
Total | $ 21,079,000 | $ 21,300,000 |