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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, 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
Equipment, Enterprise Software and Leasehold Improvements, net | 1,971 |  |  |  | 2,476 |  |  |  | 1,971 | 2,476 | 2,208
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 189,890 | 188,710 | 172,610
Equipment, Enterprise Software and Leasehold Improvements, net | 1,613 |  |  |  | 2,095 |  |  |  | 1,613 | 2,095 | 1,956
Canada [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 3,603 | 2,918 | 3,125
Equipment, Enterprise Software and Leasehold Improvements, net | 7 |  |  |  | 8 |  |  |  | 7 | 8 | 17
India and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 608 | 1,946 | 1,429
Equipment, Enterprise Software and Leasehold Improvements, net | $ 351 |  |  |  | $ 373 |  |  |  | $ 351 | $ 373 | $ 235

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