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Marketable Securities & Fair Value Measurements - Available-for-sale Measured at Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Jun. 30, 2019
Marketable Securities [Abstract]    
Available-for-sale Securities, Current $ 20,396 $ 38,193
Available-for-sale Securities, Noncurrent 16,993 9,832
Recurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Equity Securities, Amortized Cost Basis 37,448 47,947
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 16 78
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (75) 0
Debt Securities, Available-for-sale 37,389 48,025
Marketable Securities [Abstract]    
Total marketable securities 37,688 48,435
Recurring | Commercial Paper    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Equity Securities, Amortized Cost Basis   14,277
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax   0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax   0
Debt Securities, Available-for-sale   14,277
Marketable Securities [Abstract]    
Total marketable securities   14,277
Recurring | Corporate Debt Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Equity Securities, Amortized Cost Basis 28,540 26,466
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 16 64
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (44) 0
Debt Securities, Available-for-sale 28,512 26,530
Marketable Securities [Abstract]    
Total marketable securities 28,512 26,530
Recurring | Asset-backed Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Equity Securities, Amortized Cost Basis 8,908 7,204
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0 14
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (31) 0
Debt Securities, Available-for-sale 8,877 7,218
Marketable Securities [Abstract]    
Total marketable securities 8,877 7,218
Recurring | Equity Funds    
Marketable Securities [Abstract]    
Total marketable securities $ 299 $ 410