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Selected Consolidated Financial Statement Information - Accounts Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jun. 30, 2017
Accounts Receivable    
Accounts receivable $ 28,687 $ 29,336
Less: Allowance for doubtful accounts (826) (864)
Accounts receivable, net $ 27,861 $ 28,472