Restructuring Obligations and Charges (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) Employee
Restructuring Reserve [Roll Forward]
Restructuring obligations, beginning of period	$ 0
Restructuring costs incurred	1,146
Cash payments	(1,065)
Restructuring obligations, end of period	81
Contract Terminations [Member]
Restructuring Reserve [Roll Forward]
Restructuring obligations, beginning of period	0
Restructuring costs incurred	113
Cash payments	(82)
Restructuring obligations, end of period	$ 31
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Reduction in number of employees | Employee	78
Expected severance cost remaining	$ 50
Restructuring Reserve [Roll Forward]
Restructuring obligations, beginning of period	0
Restructuring costs incurred	1,033
Cash payments	(983)
Restructuring obligations, end of period	$ 50