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 ($)	Jun. 02, 2016	Nov. 30, 2016 employee	May 31, 2016 employee	Dec. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2016 USD ($)
Payables and Accruals [Line Items]
Payments to terminate lease agreement							$ 200,000
Gain on lease termination						$ 0	310,000
Number of positions eliminated | employee			5	30
Employee Severance [Member]
Payables and Accruals [Line Items]
Restructuring costs						200,000		$ 300,000
Chief Financial Officer [Member]
Payables and Accruals [Line Items]
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]
Payables and Accruals [Line Items]
Payments to terminate lease agreement					$ 200,000
Gain on lease termination							$ 300,000