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Discontinued Operations - Schedule of Income from Discontinued Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Revenues | $ 6,324 | $ 4,505 | $ 13,164 | $ 9,939
Operating expenses |  |  |  |
Direct costs | 5,502 | 3,213 | 11,580 | 7,849
General and administrative | 322 | 390 | 631 | 707
Sales and marketing | 8 | 1 | 18 | 1
Operating income | 492 | 901 | 935 | 1,382
Interest expense | 29 | 28 | 18 | 25
Other income | (58) | (77) | (116) | (226)
CES | Discontinued Operations, Held-for-sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Revenues | 2,626 | 1,960 | 4,103 | 3,491
Operating expenses |  |  |  |
Direct costs | 1,958 | 1,097 | 3,045 | 2,479
General and administrative | 653 | 247 | 1,039 | 526
Sales and marketing | 132 | 220 | 280 | 379
Operating income | (117) | 396 | (261) | 107
Interest expense | (1) | (16) | (1) | (31)
Other income | 0 | 2 | 0 | 13
Income (loss) from discontinued operations, before loss on classification | (118) | 382 | (262) | 89
Loss on classification as held for sale | (325) | 0 | (325) | 0
Income (loss) from discontinued operations, before loss on classification | $ (443) | $ 382 | $ (587) | $ 89

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