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Business Segments and Geographic Information - Summary of Revenue from External Customers (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
Equipment, Enterprise Software and Leasehold Improvements, net	2,476				2,208				2,476	2,208	1,899
United States [Member]
Segment Reporting Information [Line Items]
Revenues									188,710	172,610	145,513
Equipment, Enterprise Software and Leasehold Improvements, net	2,095				1,956				2,095	1,956	1,730
Canada [Member]
Segment Reporting Information [Line Items]
Revenues									2,918	3,125	1,729
Equipment, Enterprise Software and Leasehold Improvements, net	8				17				8	17	19
India and Other [Member]
Segment Reporting Information [Line Items]
Revenues									1,946	1,429	640
Equipment, Enterprise Software and Leasehold Improvements, net	$ 373				$ 235				$ 373	$ 235	$ 150

X

- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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