Segment Reporting (Details) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($) segment	Sep. 30, 2019 segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment	2	1
Revenues			$ 15,333	$ 12,827
Cost of revenues			7,280	7,427
Gross profit			$ 8,053	$ 5,400
Gross profit %			52.50%	42.10%
Total operating expenses			$ 18,117	$ 12,974
Income (loss) from operations			(10,064)	(7,574)
Interest and other income (expense), net			2,746	(187)
Loss before income taxes			(7,318)	(7,761)
Income tax expense			103	0
Net loss			(7,421)	(7,761)
Total assets	$ 29,143		29,143	34,909
Allocated operating expenses
Segment Reporting Information [Line Items]
Total operating expenses			11,392	12,018
Unallocated operating expenses
Segment Reporting Information [Line Items]
Total operating expenses			6,725	956
Oblong (formerly Glowpoint)
Segment Reporting Information [Line Items]
Revenues			6,227	9,660
Cost of revenues			3,789	6,269
Gross profit			$ 2,438	$ 3,391
Gross profit %			39.20%	35.10%
Total operating expenses			$ 1,479	$ 6,835
Income (loss) from operations			959	(3,444)
Interest and other income (expense), net			(19)	0
Loss before income taxes			940	(3,444)
Income tax expense			50	0
Net loss			890	(3,444)
Total assets	6,494		6,494	5,942
Oblong (formerly Glowpoint) | Allocated operating expenses
Segment Reporting Information [Line Items]
Total operating expenses			1,479	6,835
Oblong (formerly Glowpoint) | Unallocated operating expenses
Segment Reporting Information [Line Items]
Total operating expenses			0	0
Oblong Industries
Segment Reporting Information [Line Items]
Revenues			9,106	3,167
Cost of revenues			3,491	1,158
Gross profit			$ 5,615	$ 2,009
Gross profit %			61.70%	63.40%
Total operating expenses			$ 9,913	$ 5,183
Income (loss) from operations			(4,298)	(3,173)
Interest and other income (expense), net			2,765	0
Loss before income taxes			(1,533)	(3,173)
Income tax expense			53	0
Net loss			(1,586)	(3,173)
Total assets	22,649		22,649	28,967
Oblong Industries | Allocated operating expenses
Segment Reporting Information [Line Items]
Total operating expenses			9,913	5,183
Oblong Industries | Unallocated operating expenses
Segment Reporting Information [Line Items]
Total operating expenses			0	0
Corporate
Segment Reporting Information [Line Items]
Revenues			0	0
Cost of revenues			0	0
Gross profit			$ 0	$ 0
Gross profit %			0.00%	0.00%
Total operating expenses			$ 6,725	$ 956
Income (loss) from operations			(6,725)	(956)
Interest and other income (expense), net			0	(187)
Loss before income taxes			(6,725)	(1,143)
Income tax expense			0	0
Net loss			(6,725)	(1,143)
Total assets	$ 0		0	0
Corporate | Allocated operating expenses
Segment Reporting Information [Line Items]
Total operating expenses			0	0
Corporate | Unallocated operating expenses
Segment Reporting Information [Line Items]
Total operating expenses			$ 6,725	$ 956