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Restructuring Charges - Roll-Forward of Accrued Restructuring Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring Reserve [Roll Forward]
Accrued at January 1, 2018			$ 23
Restructuring charges	$ 0	$ 0	571	$ 0
Payments			(314)
Accrued at September 30, 2018	232		232
Non-cash settlement			(48)
Severance expenses [Member]
Restructuring Reserve [Roll Forward]
Accrued at January 1, 2018			0
Restructuring charges			366
Payments			(284)
Accrued at September 30, 2018	82		82
Non-cash settlement			0
Write-downs and retirements of fixed assets [Member]
Restructuring Reserve [Roll Forward]
Accrued at January 1, 2018			0
Restructuring charges			48
Payments			0
Accrued at September 30, 2018	0		0
Non-cash settlement			(48)
Lease cancellations [Member]
Restructuring Reserve [Roll Forward]
Accrued at January 1, 2018			23
Restructuring charges			157
Payments			(30)
Accrued at September 30, 2018	$ 150		150
Non-cash settlement			$ 0