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Long-Term Debt and Conversion to Royalty Obligation (Details) - Loans payable - USD ($) $ in Millions	Sep. 30, 2021	Mar. 31, 2005
IDED
Debt Instrument [Line Items]
Loan available balance		$ 6.0
Royalty rate	0.50%
Outstanding balance	$ 6.0
IEDA
Debt Instrument [Line Items]
Royalty sales cap	$ 6.8

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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