Revenue - Schedule of Disaggregated Revenue by Contract Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Total revenue	$ 12,557	$ 14,799
Video collaboration services
Disaggregation of Revenue [Line Items]
Total revenue	7,589	8,958
Network services
Disaggregation of Revenue [Line Items]
Total revenue	4,351	5,562
Total revenue
Disaggregation of Revenue [Line Items]
Total revenue	$ 617	$ 279
Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenue	100.00%	100.00%
Product Concentration Risk | Video collaboration services
Disaggregation of Revenue [Line Items]
Percentage of revenue	60.00%	60.00%
Product Concentration Risk | Network services
Disaggregation of Revenue [Line Items]
Percentage of revenue	35.00%	38.00%
Product Concentration Risk | Total revenue
Disaggregation of Revenue [Line Items]
Percentage of revenue	5.00%	2.00%