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Stock-Based Compensation and 401(k) Plan - Summary of Stock-Based Compensation Expense by Operating Expense Excluding Discontinued Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Total stock-based compensation expense $ 5,041 $ 4,007
Cost of Service Revenue [Member]    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Total stock-based compensation expense 343 186
Cost of Equipment Revenue [Member]    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Total stock-based compensation expense 287 208
Engineering, Design and Development [Member]    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Total stock-based compensation expense 754 494
Sales and Marketing [Member]    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Total stock-based compensation expense 738 549
General and Administrative [Member]    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Total stock-based compensation expense $ 2,919 $ 2,570