Segment Reporting (Details) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment							2
Revenue	$ 1,799			$ 3,266			$ 5,766	$ 11,410
Cost of revenues	1,228			1,612			3,767	5,684
Gross profit	$ 571			$ 1,654			$ 1,999	$ 5,726
Gross profit %	32.00%			51.00%			35.00%	50.00%
Total operating expenses	$ 3,682			$ 3,644			$ 10,999	$ 14,002
Income (loss) from operations	(3,111)			(1,990)			(9,000)	(8,276)
Interest and other expense (income), net	(2,449)			95			(2,659)	322
Loss before income taxes	(662)			(2,085)			(6,341)	(8,598)
Income tax expense	0			0			0	0
Net loss	(662)	$ (2,246)	$ (3,433)	(2,085)	$ (3,385)	$ (3,129)	(6,341)	(8,598)
Allocated operating expenses
Segment Reporting Information [Line Items]
Total operating expenses	2,054			2,664			5,921	10,943
Unallocated operating expenses
Segment Reporting Information [Line Items]
Total operating expenses	1,628			980			5,078	3,059
Oblong (formerly Glowpoint)
Segment Reporting Information [Line Items]
Revenue	1,006			1,324			3,279	4,741
Cost of revenues	721			893			2,293	2,948
Gross profit	$ 285			$ 431			$ 986	$ 1,793
Gross profit %	28.00%			33.00%			30.00%	38.00%
Total operating expenses	$ 337			$ 1,187			$ 527	$ 3,398
Income (loss) from operations	(52)			(756)			459	(1,605)
Interest and other expense (income), net	2			5			16	12
Loss before income taxes	(54)			(761)			443	(1,617)
Income tax expense	0			0			0	0
Net loss	(54)			(761)			443	(1,617)
Oblong (formerly Glowpoint) | Allocated operating expenses
Segment Reporting Information [Line Items]
Total operating expenses	337			1,187			527	3,398
Oblong (formerly Glowpoint) | Unallocated operating expenses
Segment Reporting Information [Line Items]
Total operating expenses	0			0				0
Oblong Industries
Segment Reporting Information [Line Items]
Revenue	793			1,942			2,487	6,669
Cost of revenues	507			719			1,474	2,736
Gross profit	$ 286			$ 1,223			$ 1,013	$ 3,933
Gross profit %	36.00%			63.00%			41.00%	59.00%
Total operating expenses	$ 1,717			$ 1,477			$ 5,394	$ 7,545
Income (loss) from operations	(1,431)			(254)			(4,381)	(3,612)
Interest and other expense (income), net	(3)			90			(227)	310
Loss before income taxes	(1,428)			(344)			(4,154)	(3,922)
Income tax expense	0			0			0	0
Net loss	(1,428)			(344)			(4,154)	(3,922)
Oblong Industries | Allocated operating expenses
Segment Reporting Information [Line Items]
Total operating expenses	1,717			1,477			5,394	7,545
Oblong Industries | Unallocated operating expenses
Segment Reporting Information [Line Items]
Total operating expenses	0			0				0
Corporate
Segment Reporting Information [Line Items]
Revenue	0			0			0	0
Cost of revenues	0			0			0	0
Gross profit	0			0			0	0
Total operating expenses	1,628			980			5,078	3,059
Income (loss) from operations	(1,628)			(980)			(5,078)	(3,059)
Interest and other expense (income), net	(2,448)			0			(2,448)	0
Loss before income taxes	820			(980)			(2,630)	(3,059)
Income tax expense	0			0			0	0
Net loss	820			(980)			(2,630)	(3,059)
Corporate | Allocated operating expenses
Segment Reporting Information [Line Items]
Total operating expenses	0			0			0	0
Corporate | Unallocated operating expenses
Segment Reporting Information [Line Items]
Total operating expenses	$ 1,628			$ 980			$ 5,078	$ 3,059