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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total allocated share-based compensation expense | $ 2,462 | $ 2,697 | $ 7,351 | $ 7,964
Cost of Services and Fulfillment [Member] |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total allocated share-based compensation expense | 1,554 | 1,638 | 4,389 | 4,463
Selling and Marketing [Member] |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total allocated share-based compensation expense | 372 | 446 | 1,220 | 1,231
General and Administrative [Member] |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total allocated share-based compensation expense | $ 536 | $ 613 | $ 1,742 | $ 2,270

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