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Statements of Operations-Additional Information (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Interest expense, net        
Amortization of debt issuance costs and debt discount $ 221 $ 221 $ 662 $ 662
Acquisition-related accrued interest 0 290 0 795
Other 99 45 382 286
Interest expense 3,419 3,293 10,124 10,043
Interest (income) (488) (229) (1,395) (811)
Interest expense, net 2,931 3,064 8,729 9,232
Depreciation and amortization        
Depreciation of property, plant and equipment 5,324 5,261 15,820 15,666
Amortization of intangible assets 1,538 1,477 4,550 4,323
Amortization of other assets 13 13 37 37
Depreciation and amortization 6,875 6,751 20,407 20,026
Term loan        
Interest expense, net        
Interest expense 2,077 2,071 6,391 6,214
Revolving credit facility        
Interest expense, net        
Interest expense $ 1,022 $ 666 $ 2,689 $ 2,086