Accrued Expenses and Other Current Liabilities (Severance and Restructuring Accruals) (Narrative) (Details)		1 Months Ended	12 Months Ended
	Dec. 04, 2018 USD ($)	Aug. 30, 2019 employee	Sep. 30, 2019 USD ($)
Payables and Accruals [Line Items]
Number of positions eliminated (employee) | employee		40
Restructuring charges			$ 531,000
Chief Financial Officer
Payables and Accruals [Line Items]
Base salary continuance period	2 months
Estimated charge related to separation agreement			100,000
Employee Severance
Payables and Accruals [Line Items]
Restructuring charges			$ 531,000
Employee Severance | Chief Financial Officer
Payables and Accruals [Line Items]
Payment per Separation Agreement	$ 22,875