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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 | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total allocated share-based compensation expense | $ 2,397 | $ 2,464 | $ 4,889 | $ 5,266
Cost of Services and Fulfillment [Member] |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total allocated share-based compensation expense | 1,401 | 1,232 | 2,835 | 2,825
Selling and Marketing [Member] |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total allocated share-based compensation expense | 399 | 423 | 848 | 785
General and Administrative [Member] |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Total allocated share-based compensation expense | $ 597 | $ 809 | $ 1,206 | $ 1,656

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