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Investments and Fair Value Measurements - Fair Value Measurements (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Assets:    
Debt securities available for sale $ 80,585 $ 103,906
Total investment securities at fair value 115,824 146,687
Long-term investment securities at fair value 28,582 32,089
Marketable equity securities    
Assets:    
Total equity securities at fair value 13,467 19,560
Mutual funds invested in debt securities    
Assets:    
Total equity securities at fair value 21,772 23,221
U.S. government securities    
Assets:    
Debt securities available for sale 1,572  
Corporate securities    
Assets:    
Debt securities available for sale 51,986  
U.S. government and federal agency    
Assets:    
Debt securities available for sale 27,027  
Recurring    
Assets:    
Total investment securities at fair value 115,824 146,687
Long-term investment securities at fair value 28,582 32,089
Total 533,721 333,895
Liabilities:    
Fair value of contingent liability   2,646
Total   2,646
Recurring | Total equity securities at fair value    
Assets:    
Total equity securities at fair value 35,239 42,781
Recurring | Marketable equity securities    
Assets:    
Total equity securities at fair value 13,467 19,560
Recurring | Mutual funds invested in debt securities    
Assets:    
Total equity securities at fair value 21,772 23,221
Recurring | Total debt securities available for sale    
Assets:    
Debt securities available for sale 80,585 103,906
Recurring | U.S. government securities    
Assets:    
Debt securities available for sale 1,572 6,481
Recurring | Corporate securities    
Assets:    
Debt securities available for sale 51,986 47,531
Recurring | U.S. government and federal agency    
Assets:    
Debt securities available for sale 27,027 19,572
Recurring | Commercial paper    
Assets:    
Debt securities available for sale   29,103
Recurring | Foreign fixed-income securities    
Assets:    
Debt securities available for sale   1,219
Recurring | Money market funds    
Assets:    
Cash and cash equivalents 311,082 130,583
Recurring | Commercial paper    
Assets:    
Cash and cash equivalents 53,990 24,426
Recurring | Certificates of deposit    
Assets:    
Cash and cash equivalents 110 110
Recurring | Money market funds securing legal bonds    
Assets:    
Cash and cash equivalents 24,133  
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Total investment securities at fair value 35,239 42,781
Long-term investment securities at fair value 0 0
Total 370,454 173,364
Liabilities:    
Fair value of contingent liability   0
Total   0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Total equity securities at fair value    
Assets:    
Total equity securities at fair value 35,239 42,781
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Marketable equity securities    
Assets:    
Total equity securities at fair value 13,467 19,560
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds invested in debt securities    
Assets:    
Total equity securities at fair value 21,772 23,221
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Total debt securities available for sale    
Assets:    
Debt securities available for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government securities    
Assets:    
Debt securities available for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate securities    
Assets:    
Debt securities available for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government and federal agency    
Assets:    
Debt securities available for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial paper    
Assets:    
Debt securities available for sale   0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign fixed-income securities    
Assets:    
Debt securities available for sale   0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds    
Assets:    
Cash and cash equivalents 311,082 130,583
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial paper    
Assets:    
Cash and cash equivalents 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Certificates of deposit    
Assets:    
Cash and cash equivalents 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds securing legal bonds    
Assets:    
Cash and cash equivalents 24,133  
Recurring | Significant Other Observable Inputs (Level 2)    
Assets:    
Total investment securities at fair value 80,585 103,906
Long-term investment securities at fair value 0 0
Total 134,685 128,442
Liabilities:    
Fair value of contingent liability   0
Total   0
Recurring | Significant Other Observable Inputs (Level 2) | Total equity securities at fair value    
Assets:    
Total equity securities at fair value 0 0
Recurring | Significant Other Observable Inputs (Level 2) | Marketable equity securities    
Assets:    
Total equity securities at fair value 0 0
Recurring | Significant Other Observable Inputs (Level 2) | Mutual funds invested in debt securities    
Assets:    
Total equity securities at fair value 0 0
Recurring | Significant Other Observable Inputs (Level 2) | Total debt securities available for sale    
Assets:    
Debt securities available for sale 80,585 103,906
Recurring | Significant Other Observable Inputs (Level 2) | U.S. government securities    
Assets:    
Debt securities available for sale 1,572 6,481
Recurring | Significant Other Observable Inputs (Level 2) | Corporate securities    
Assets:    
Debt securities available for sale 51,986 47,531
Recurring | Significant Other Observable Inputs (Level 2) | U.S. government and federal agency    
Assets:    
Debt securities available for sale 27,027 19,572
Recurring | Significant Other Observable Inputs (Level 2) | Commercial paper    
Assets:    
Debt securities available for sale   29,103
Recurring | Significant Other Observable Inputs (Level 2) | Foreign fixed-income securities    
Assets:    
Debt securities available for sale   1,219
Recurring | Significant Other Observable Inputs (Level 2) | Money market funds    
Assets:    
Cash and cash equivalents 0 0
Recurring | Significant Other Observable Inputs (Level 2) | Commercial paper    
Assets:    
Cash and cash equivalents 53,990 24,426
Recurring | Significant Other Observable Inputs (Level 2) | Certificates of deposit    
Assets:    
Cash and cash equivalents 110 110
Recurring | Significant Other Observable Inputs (Level 2) | Money market funds securing legal bonds    
Assets:    
Cash and cash equivalents 0  
Recurring | Significant Unobservable Inputs (Level 3)    
Assets:    
Total investment securities at fair value 0 0
Long-term investment securities at fair value 0 0
Total 0 0
Liabilities:    
Fair value of contingent liability   2,646
Total   2,646
Recurring | Significant Unobservable Inputs (Level 3) | Total equity securities at fair value    
Assets:    
Total equity securities at fair value 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Marketable equity securities    
Assets:    
Total equity securities at fair value 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Mutual funds invested in debt securities    
Assets:    
Total equity securities at fair value 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Total debt securities available for sale    
Assets:    
Debt securities available for sale 0 0
Recurring | Significant Unobservable Inputs (Level 3) | U.S. government securities    
Assets:    
Debt securities available for sale 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Corporate securities    
Assets:    
Debt securities available for sale 0 0
Recurring | Significant Unobservable Inputs (Level 3) | U.S. government and federal agency    
Assets:    
Debt securities available for sale 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Commercial paper    
Assets:    
Debt securities available for sale   0
Recurring | Significant Unobservable Inputs (Level 3) | Foreign fixed-income securities    
Assets:    
Debt securities available for sale   0
Recurring | Significant Unobservable Inputs (Level 3) | Money market funds    
Assets:    
Cash and cash equivalents 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Commercial paper    
Assets:    
Cash and cash equivalents 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Certificates of deposit    
Assets:    
Cash and cash equivalents 0 $ 0
Recurring | Significant Unobservable Inputs (Level 3) | Money market funds securing legal bonds    
Assets:    
Cash and cash equivalents $ 0