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Business Segments and Geographic Information - Summary of Operating Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 48,710 | $ 47,383 | $ 47,583 | $ 50,425 | $ 50,360 | $ 49,543 | $ 48,472 | $ 45,199 | $ 194,101 | $ 193,574 | $ 177,164
Total gross margin % |  |  |  |  |  |  |  |  | 26.60% | 24.80% | 24.00%
Segment operating income |  |  |  |  |  |  |  |  | $ 13,403 | $ 16,987 | $ 11,625
Revaluation of contingent consideration liability |  |  |  |  |  |  |  |  |  | 6,069 | 11,056
Goodwill impairment |  |  |  |  |  |  |  |  |  |  | (9,738)
Amortization of acquired intangible assets |  |  |  |  |  |  |  |  | (2,790) | (2,688) | (2,727)
Acquisition transaction expenses |  |  |  |  |  |  |  |  | (650) | 110 | 140
Interest expenses and other, net |  |  |  |  |  |  |  |  | (770) | (1,768) | (2,211)
Income before income taxes |  |  |  |  |  |  |  |  | 12,633 | 15,219 | 9,414
Data and analytics services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 30,226 | $ 26,663 | $ 23,803
Total gross margin % |  |  |  |  |  |  |  |  | 50.50% | 46.70% | 44.00%
Goodwill impairment |  |  |  |  |  |  |  |  |  |  | $ (9,738)
IT staffing services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 163,875 | $ 166,911 | $ 153,361
Total gross margin % |  |  |  |  |  |  |  |  | 22.10% | 21.30% | 20.90%
Goodwill impairment |  |  |  |  |  |  |  |  |  | $ 0 |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment operating income |  |  |  |  |  |  |  |  | $ 16,843 | 13,496 | $ 12,894
Operating Segments [Member] | Data and analytics services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment operating income |  |  |  |  |  |  |  |  | 5,455 | 5,495 | 5,710
Operating Segments [Member] | IT staffing services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment operating income |  |  |  |  |  |  |  |  | $ 11,388 | $ 8,001 | $ 7,184

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