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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