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Shareholders' Equity - Stock Based Compensation Expense Recorded Within Continuing Operations in Condensed Consolidated Statements of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock based compensation expense | $ 569 | $ 459 | $ 3,643 | $ 1,306
Cost of Revenues (Excluding Depreciation and Amortization) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock based compensation expense | 13 | 10 | 684 | 28
Product Development [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock based compensation expense | 77 | 72 | 895 | 217
Sales and Marketing [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock based compensation expense | 57 | 50 | 575 | 132
Other General and Administrative [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock based compensation expense | $ 422 | $ 327 | $ 1,489 | $ 929

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