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Balance Sheets-Additional Information (Details 1) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Dec. 31, 2017
Jun. 30, 2017
Goodwill roll-forward    
Balance at beginning of period $ 23,982 $ 21,121
Purchase price allocation adjustment 0 2,861
Acquisition 5,642 0
Balance at end of period $ 29,624 $ 23,982