Segment Reporting - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 872	$ 1,185	$ 2,866	$ 4,050
Product Concentration Risk
Disaggregation of Revenue [Line Items]
Revenue	$ 872	$ 1,185	$ 2,866	$ 4,050
Revenue | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenue (in percent)	100.00%	100.00%	100.00%	100.00%
Managed Services | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Revenue	$ 603	$ 797	$ 1,933	$ 2,573
Managed Services | Revenue | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenue (in percent)	69.00%	67.00%	67.00%	64.00%
Managed Services | Video collaboration services | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Revenue	$ 38	$ 69	$ 148	$ 264
Managed Services | Video collaboration services | Revenue | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenue (in percent)	4.00%	6.00%	5.00%	7.00%
Managed Services | Network services | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Revenue	$ 557	$ 716	$ 1,758	$ 2,260
Managed Services | Network services | Revenue | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenue (in percent)	64.00%	60.00%	61.00%	56.00%
Managed Services | Professional and other services | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Revenue	$ 8	$ 12	$ 27	$ 49
Managed Services | Professional and other services | Revenue | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenue (in percent)	1.00%	1.00%	1.00%	1.00%
Collaboration Products | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Revenue	$ 269	$ 388	$ 933	$ 1,477
Collaboration Products | Revenue | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenue (in percent)	31.00%	33.00%	33.00%	36.00%
Collaboration Products | Video collaboration services | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Revenue	$ 268	$ 385	$ 932	$ 1,467
Collaboration Products | Video collaboration services | Revenue | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenue (in percent)	31.00%	33.00%	33.00%	36.00%
Collaboration Products | Professional services | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Revenue			$ 1	$ 0
Collaboration Products | Professional services | Revenue | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenue (in percent)			0.00%	0.00%
Collaboration Products | Licensing | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Revenue	$ 0	$ 3	$ 0	$ 10
Collaboration Products | Licensing | Revenue | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenue (in percent)	0.00%	0.00%	0.00%	0.00%
Domestic
Disaggregation of Revenue [Line Items]
Revenue	$ 356	$ 575	$ 1,356	$ 2,120
Foreign
Disaggregation of Revenue [Line Items]
Revenue	$ 516	$ 610	$ 1,510	$ 1,930