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Investments - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Jul. 01, 2018
Jun. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Impact from adoption of ASU 2016-01         $ 0  
Purchases of available-for-sale securities   $ 0        
Sale of available-for-sale securities $ 0 $ 48,000 $ 97,000 $ 144,000    
Transfers of assets between Level 1 and Level 2 0   0      
Other-than-temporary impairments     0      
Carrying value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total short-term investments $ 5,593,000   $ 5,593,000     $ 2,538,000
Accumulated Other Comprehensive Income            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Impact from adoption of ASU 2016-01         (101,000)  
Accumulated Deficit            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Impact from adoption of ASU 2016-01         $ 101,000