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Contractual interest rate for funds borrowed, under the debt agreement.

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Business And Significant Accounting Policies (Liquidity) (Details) - USD ($) $ in Thousands	Apr. 29, 2020	Mar. 31, 2020	Dec. 31, 2019	May 21, 2013
Extinguishment of Debt [Line Items]
Accrued and unpaid interest held by convertible debt holders		$ 3,737	$ 1,351
Convertible Notes
Extinguishment of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				4.50%
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
Debt Instrument, Interest Rate, Stated Percentage	4.50%
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