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Stockholders' Equity - Summary of Stock-Based Compensation Recorded in Expense Categories in Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total allocated share-based compensation expense | $ 2,697 | $ 3,072 | $ 7,964 | $ 8,605
Cost of Services and Fulfillment [Member] |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total allocated share-based compensation expense | 1,638 | 1,782 | 4,463 | 4,812
Selling and Marketing [Member] |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total allocated share-based compensation expense | 446 | 441 | 1,231 | 1,366
General and Administrative [Member] |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total allocated share-based compensation expense | $ 613 | $ 849 | $ 2,270 | $ 2,427

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