XML 53 R53.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Fair Value Measurements (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Transfers between Levels 1 and 2      
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 0 $ 0  
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 0 0  
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount 0 0  
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount 0 0  
Transfers into and out of Level 3      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 0 0  
Recurring | Available-for-sale securities      
Financial Assets:      
Total financial assets 401,542,000 134,000,000  
Recurring | Money market deposits      
Financial Assets:      
Total financial assets 22,477,000 26,539,000  
Recurring | U.S. Treasury securities      
Financial Assets:      
Total financial assets 293,157,000 75,685,000  
Recurring | U.S. agency securities      
Financial Assets:      
Total financial assets   12,891,000  
Recurring | Municipal securities      
Financial Assets:      
Total financial assets 85,908,000 18,885,000  
Recurring | Level 1 | Available-for-sale securities      
Financial Assets:      
Total financial assets 315,634,000 102,224,000  
Recurring | Level 1 | Money market deposits      
Financial Assets:      
Total financial assets 22,477,000 26,539,000  
Recurring | Level 1 | U.S. Treasury securities      
Financial Assets:      
Total financial assets 293,157,000 75,685,000  
Recurring | Level 2 | Available-for-sale securities      
Financial Assets:      
Total financial assets 85,908,000 31,776,000  
Recurring | Level 2 | U.S. agency securities      
Financial Assets:      
Total financial assets   12,891,000  
Recurring | Level 2 | Municipal securities      
Financial Assets:      
Total financial assets $ 85,908,000 $ 18,885,000  
Contingent consideration | Evercord      
Liabilities:      
Total consideration     $ 4,700,000