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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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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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