| Debt (Credit Agreement Interest Expense) (Details) | 3 Months Ended | 
|---|---|
| Dec. 31, 2018  USD ($) | |
| Debt [Abstract] | |
| Amortization of credit agreement and residual royalty agreement | $ 1,158,206 | 
| Accretion of residual royalty agreement liability | 92,351 | 
| Amortization of deferred issuance costs | 27,866 | 
| Interest expense | $ 1,278,423 | 
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- Definition Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount of amortization expense attributable to debt issuance costs. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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- Definition Amount of amortization expense attributable to debt discount (premium) and debt issuance costs. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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- References No definition available. 
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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