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Marketable Securities & Fair Value Measurements - Available-for-sale Measured at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Marketable Securities [Abstract]    
Available-for-sale Securities, Current $ 123,075 $ 40,088
Available-for-sale Securities, Noncurrent 6,839 6,276
Recurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Equity Securities, Amortized Cost Basis 129,714 46,095
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 208 270
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (8) (1)
Debt Securities, Available-for-sale 129,914 46,364
Marketable Securities [Abstract]    
Total marketable securities 130,266 46,691
Recurring | Commercial Paper    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Equity Securities, Amortized Cost Basis 32,060 9,778
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0 0
Debt Securities, Available-for-sale 32,060 9,778
Marketable Securities [Abstract]    
Total marketable securities 32,060 9,778
Recurring | Corporate Debt Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Equity Securities, Amortized Cost Basis 39,695 21,267
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 164 232
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (5) (1)
Debt Securities, Available-for-sale 39,854 21,498
Marketable Securities [Abstract]    
Total marketable securities 39,854 21,498
Recurring | Asset-backed Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Equity Securities, Amortized Cost Basis 11,317 8,930
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 39 37
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0 0
Debt Securities, Available-for-sale 11,356 8,967
Marketable Securities [Abstract]    
Total marketable securities 11,356 8,967
Recurring | Equity Funds    
Marketable Securities [Abstract]    
Total marketable securities 352 327
Recurring | U.S. government securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Equity Securities, Amortized Cost Basis 46,642 6,120
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 5 1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (3) 0
Debt Securities, Available-for-sale 46,644 6,121
Marketable Securities [Abstract]    
Total marketable securities $ 46,644 $ 6,121