v3.21.1

Summary of significant accounting policies - Segment and geographic information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($) segment
Revenue by primary revenue sources
Number of reportable segment | segment	5	1
Revenue:
Revenue	$ 59,929	$ 59,886
Income (loss) from operations:
Unallocated overhead costs	(13,828)	(12,365)
Total loss from operations	(5,858)	(2,585)
Interest expense and amortization of debt discount	(657)	(2,349)
Interest income and other expense, net	(2)	254
Loss before income taxes	(6,517)	(4,680)
Carrier Services
Revenue:
Revenue	26,883	26,848
Income (loss) from operations:
Total loss from operations	2,621	5,866
Military/broadband
Revenue:
Revenue	20,645	18,002
Income (loss) from operations:
Total loss from operations	7,265	4,800
Multifamily
Revenue:
Revenue	5,304	5,224
Income (loss) from operations:
Total loss from operations	(1,680)	(1,930)
Legacy
Revenue:
Revenue	6,204	9,302
Income (loss) from operations:
Total loss from operations	(307)	603
Private networks and emerging technologies
Revenue:
Revenue	893	510
Income (loss) from operations:
Total loss from operations	$ 71	$ 441

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