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Marketable Securities & Fair Value Measurements - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Transfers of assets between Level 1 and Level 2 $ 0  
Equity Securities without Readily Determinable Fair Value, Amount 6,793 $ 6,306
Future payments to acquire long-term investments 2,750  
Other-than-temporary impairments $ 0