Liabilities (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Reconciliation of the restructuring liability
Balance at the beginning of the period	$ 824
Provision	102
Changes in estimate	(2)
Payments	(487)
Balance at the end of the period	437
Customer Deposits and Deferred Revenue
Customer deposits	28,900	$ 28,200
Personnel severance and related costs
Reconciliation of the restructuring liability
Balance at the beginning of the period	824
Changes in estimate	(2)
Payments	(385)
Balance at the end of the period	437
Facility Closing Costs
Reconciliation of the restructuring liability
Provision	102
Payments	$ (102)