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Fair Value Measurements - Fair Value Hierarchy (Details) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) item
--- | --- | ---
Fair Value, Inputs, Level 3 |  |
Assets |  |
Total assets | $ 0 | $ 0
Liabilities |  |
Total liabilities | 0 | 0
Fair Value, Measurements, Recurring |  |
Assets |  |
Total assets | 324,967,000 | 323,273,000
Liabilities |  |
Total liabilities | 7,302,000 | 5,232,000
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets |  |
Total assets | 4,212,000 | 5,169,000
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 320,755,000 | 318,104,000
Liabilities |  |
Total liabilities | 7,302,000 | 5,232,000
Money market funds | Fair Value, Measurements, Recurring |  |
Assets |  |
Total assets | 4,212,000 | 5,169,000
Money market funds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets |  |
Total assets | 4,212,000 | 5,169,000
U.S. Government agency bonds | Fair Value, Measurements, Recurring |  |
Assets |  |
Total assets | 123,271,000 | 206,924,000
U.S. Government agency bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 123,271,000 | $ 206,924,000
U.S. Government bonds | Fair Value, Measurements, Recurring |  |
Assets |  |
Total assets | 76,525,000 |
U.S. Government bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 76,525,000 |
Bank certificates of deposit |  |
Assets |  |
Number of certificates of deposit | item |  | 1
Bank certificates of deposit | Fair Value, Measurements, Recurring |  |
Assets |  |
Cash equivalents |  | $ 5,000,000
Total assets | 12,492,000 | 25,708,000
Bank certificates of deposit | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 12,492,000 | 25,708,000
Commercial paper. | Fair Value, Measurements, Recurring |  |
Assets |  |
Total assets | 2,997,000 | 1,500,000
Commercial paper. | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 2,997,000 | 1,500,000
Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Total assets | 55,032,000 | 55,173,000
Corporate notes | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 55,032,000 | 55,173,000
Asset-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Total assets | 23,774,000 | 13,495,000
Asset-backed securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 23,774,000 | 13,495,000
Municipal bonds | Fair Value, Measurements, Recurring |  |
Assets |  |
Total assets | 19,252,000 | 9,972,000
Municipal bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 19,252,000 | 9,972,000
Investments held for deferred compensation plans | Fair Value, Measurements, Recurring |  |
Assets |  |
Total assets | 7,412,000 | 5,331,000
Liabilities |  |
Total liabilities | 7,302,000 | 5,232,000
Investments held for deferred compensation plans | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 7,412,000 | 5,331,000
Liabilities |  |
Total liabilities | $ 7,302,000 | $ 5,232,000

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