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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