Accrued Expenses and Other Current Liabilities (Severance and Restructuring Accruals) (Narrative) (Details)				1 Months Ended		3 Months Ended		12 Months Ended
	Jun. 07, 2016 USD ($)	Jun. 02, 2016	Dec. 10, 2014	May 31, 2016 USD ($) employee	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Severance and restructuring accruals:
Payments to terminate lease agreement								$ 200,000
Gain on lease termination								310,000	$ 0
Number of positions eliminated | employee				30
Chief Executive Officer [Member]
Severance and restructuring accruals:
Continuation of base salary period			602 days
Outplacement services, period							1 year
Outplacement services, value							$ 15,000
Estimated charge related to separation agreement										$ 800,000
Chief Administrative Officer and Chief Counsel and Secretary [Member]
Severance and restructuring accruals:
Outplacement services, period						1 year
Outplacement services, value						$ 15,000
Estimated charge related to separation agreement									$ 1,100,000
Chief Administrative Officer [Member]
Severance and restructuring accruals:
Continuation of base salary period			518 days
Chief Counsel and Secretary [Member]
Severance and restructuring accruals:
Continuation of base salary period			476 days
Chief Financial Officer [Member]
Severance and restructuring accruals:
Continuation of base salary period		448 days
Outplacement services, period	1 year
Outplacement services, value	$ 15,000
Estimated charge related to separation agreement	$ 400,000
Discontinued Operations, Disposed of by Sale [Member]
Severance and restructuring accruals:
Payments to terminate lease agreement					$ 200,000
Gain on lease termination								$ 300,000
Employee Severance [Member]
Severance and restructuring accruals:
Restructuring costs				$ 300,000