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Revenue Recognition - Costs Capitalized to Obtain Revenue Contracts (Details) - USD ($)
3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Jun. 30, 2018
Capitalized costs      
Contract cost capitalized during period $ 324,000 $ 513,000  
Amortization of contract cost 156,000 302,000  
Costs capitalized to obtain revenue contracts $ 2,600,000 $ 2,600,000 $ 2,400,000
New revenue contracts      
Capitalized costs      
Amortization period 5 years 5 years  
Renewal contracts      
Capitalized costs      
Amortization period 5 years 5 years