Subsequent Event (Details) - Subsequent Event [Member] $ in Thousands	1 Months Ended
	Jan. 30, 2018 USD ($)
Subsequent Event [Line Items]
Restructuring and Related Cost, Expected Number of Positions Eliminated	50
Expected gain from imputed financing obligation of exited facility	$ 5,000
Minimum
Subsequent Event [Line Items]
Restructuring and Related Cost, Expected Cost	2,000
Maximum
Subsequent Event [Line Items]
Restructuring and Related Cost, Expected Cost	$ 5,000