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Restructuring (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Restructuring (Details) [Line Items]          
Restructuring Costs $ 10,000 $ (29,000) $ 306,000
Restructuring Charges 10,000   224,000   51,000
Accrued Liabilities, Current $ 5,941,000   $ 5,941,000   6,046,000
Relocate Equipment And Inventory [Member]          
Restructuring (Details) [Line Items]          
Accrued Liabilities, Current         $ 253,000