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Summary of Operations and Significant Accounting Policies - Summary of Allowance for Doubtful Accounts (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Receivables [Abstract]      
Allowance for doubtful accounts, beginning balance $ 757,000 $ 888,000 $ 533,000
Charges to expense 193,000 125,000 459,000
Write-offs of uncollectible accounts, net of recoveries (490,000) (256,000) (104,000)
Allowance for doubtful accounts, ending balance $ 460,000 $ 757,000 $ 888,000