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Summary of Significant Accounting Policies - Summary of Stock-Based Compensation Expense Recorded in Expense Categories (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total allocated share-based compensation expense | $ 11,684 | $ 8,300 | $ 8,490
Cost of Services and Fulfillment [Member] |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total allocated share-based compensation expense | 6,627 | 4,329 | 4,538
Selling and Marketing [Member] |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total allocated share-based compensation expense | 1,768 | 1,065 | 717
General and Administrative [Member] |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total allocated share-based compensation expense | $ 3,289 | $ 2,906 | $ 3,235

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