New Accounting Standards and Accounting Policies - Schedule of Deferred Revenue Related to Contracts with Customers (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Total [Member]
Beginning balance at December 31, 2017	$ 8,376
Deferral of revenue	23,246
Recognition of deferred revenue	(23,475)
Foreign currency translation	(53)
Ending balance at September 30, 2018	8,094
Current [Member]
Beginning balance at December 31, 2017	7,913	[1]
Deferral of revenue	22,855
Recognition of deferred revenue	(22,638)
Foreign currency translation	(53)
Ending balance at September 30, 2018	8,077	[1]
Long-Term [Member]
Beginning balance at December 31, 2017	463	[2]
Deferral of revenue	391
Recognition of deferred revenue	(837)
Foreign currency translation
Ending balance at September 30, 2018	$ 17	[2]

[1] Presented as "Deferred revenue" on our consolidated balance sheets.

[2] Presented as part of "Other long-term liabilities" on our consolidated balance sheets.