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Long-Term Debt (Troubled Debt Restructuring) (Details) - USD ($) $ in Thousands	Apr. 29, 2020	Mar. 31, 2020	Dec. 31, 2019
Extinguishment of Debt [Line Items]
Accrued and unpaid interest held by convertible debt holders		$ 3,737	$ 1,351
Convertible Notes \| IEH Biopharma And Other Holders Trouble Debt Restructuring \| IEH Biopharma \| Subsequent event \| Convertible Notes
Extinguishment of Debt [Line Items]
Convertible Debt Principal Amount	$ 170,200
Accrued and unpaid interest held by convertible debt holders	$ 3,800
Grace period	30 days
Payments of Debt Restructuring Costs	$ 7,500
Remaining Outstanding Principal Amount Settled and Restructured	11,300
Convertible Notes \| IEH Biopharma And Other Holders Trouble Debt Restructuring \| Other Convertible Senior Notes Holder \| Subsequent event \| Convertible Notes
Extinguishment of Debt [Line Items]
Accrued and unpaid interest held by convertible debt holders	$ 253