Revenue - Schedule of Change in Deferred Revenue Related to Contract with Customers (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Total [Member]
Beginning balance at December 31, 2017	$ 8,376
Deferral of revenue	33,192
Recognition of deferred revenue	(32,765)
Foreign currency translation	(79)
Ending balance at December 31, 2018	8,724
Current [Member]
Beginning balance at December 31, 2017	7,913	[1]
Deferral of revenue	32,060
Recognition of deferred revenue	(31,928)
Foreign currency translation	(79)
Ending balance at December 31, 2018	7,966	[1]
Long-Term [Member]
Beginning balance at December 31, 2017	463	[2]
Deferral of revenue	1,132
Recognition of deferred revenue	(837)
Foreign currency translation
Ending balance at December 31, 2018	$ 758	[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.