Severance and Other Charges - Accrual for Severance and Other Exit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Accrual for severance and other exit costs
Balance, start of period	$ 335	$ 530
Provision	1,210	901
Payments	(453)	(1,096)
Balance, end of period	1,092	335
Employee severance expense
Accrual for severance and other exit costs
Balance, start of period	293	530
Provision	1,210	784
Payments	(411)	(1,021)
Balance, end of period	1,092	293
Lease exit costs
Accrual for severance and other exit costs
Balance, start of period	42
Provision		117
Payments	$ (42)	(75)
Balance, end of period		$ 42