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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
Mar. 31, 2022
Mar. 31, 2021
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Total allocated share-based compensation expense $ 3,294 $ 2,492
Cost of Services and Fulfillment [Member]    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Total allocated share-based compensation expense 1,926 1,435
Selling and Marketing [Member]    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Total allocated share-based compensation expense 633 449
General and Administrative [Member]    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Total allocated share-based compensation expense $ 735 $ 608