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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 50,360 | $ 49,543 | $ 48,472 | $ 45,199 | $ 44,645 | $ 44,292 | $ 44,894 | $ 43,333 | $ 193,574 | $ 177,164 | $ 147,882
Total gross margin % |  |  |  |  |  |  |  |  | 24.80% | 24.00% | 21.40%
Segment operating income |  |  |  |  |  |  |  |  | $ 16,987 | $ 11,625 | $ 4,081
Revaluation of contingent consideration liability |  |  |  |  |  |  |  |  | 6,069 | 11,056 |
Goodwill impairment |  |  |  |  |  |  |  |  |  | (9,738) |
Amortization of acquired intangible assets |  |  |  |  |  |  |  |  | (2,688) | (2,727) | (1,710)
Acquisition transaction expenses |  |  |  |  |  |  |  |  | 110 | 140 | (2,019)
Interest expenses and other, net |  |  |  |  |  |  |  |  | (1,768) | (2,211) | (1,133)
Income before income taxes |  |  |  |  |  |  |  |  | 15,219 | 9,414 | 2,948
Data and Analytics Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 26,663 | $ 23,803 | $ 9,185
Total gross margin % |  |  |  |  |  |  |  |  | 46.70% | 44.00% | 44.80%
Goodwill impairment |  |  |  |  |  |  |  |  |  | $ 9,738 |
IT Staffing Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 166,911 | $ 153,361 | $ 138,697
Total gross margin % |  |  |  |  |  |  |  |  | 21.30% | 20.90% | 19.80%
Goodwill impairment |  |  |  |  |  |  |  |  | $ 0 |  |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment operating income |  |  |  |  |  |  |  |  | 13,496 | $ 12,894 | $ 7,810
Operating Segments [Member] | Data and Analytics Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment operating income |  |  |  |  |  |  |  |  | 5,495 | 5,710 | 2,531
Operating Segments [Member] | IT Staffing Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment operating income |  |  |  |  |  |  |  |  | $ 8,001 | $ 7,184 | $ 5,279

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