Accrued Expenses and Other Current Liabilities (Severance and Restructuring Accruals) (Details) (USD $)	3 Months Ended	6 Months Ended		0 Months Ended	3 Months Ended	0 Months Ended	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2015	Mar. 31, 2014	Sep. 17, 2014	Sep. 30, 2014	Dec. 10, 2014	Dec. 31, 2014
Severance and restructuring accruals:
Discontinued operations, remaining lease costs	$ 700,000	$ 700,000
Chief Operating Officer
Severance and restructuring accruals:
Estimated charge related to separation agreement			500,000
Chief Executive Officer
Severance and restructuring accruals:
Estimated charge related to separation agreement					800,000
Resignation period following replacement selection				15 days
Continuation of base salary period				602 days
Continuation of benefits, period				18 months
Outplacement services, period				1 year
Outplacement services, value				15,000
Chief Administrative Officer
Severance and restructuring accruals:
Estimated charge related to separation agreement		600,000
Continuation of base salary period						518 days
Continuation of benefits, period						18 months
Outplacement services, period						1 year
Outplacement services, value						15,000
Chief Counsel and Secretary
Severance and restructuring accruals:
Estimated charge related to separation agreement							500,000
Continuation of base salary period						476 days
Continuation of benefits, period						18 months
Outplacement services, period						1 year
Outplacement services, value						$ 15,000