Quarterly report pursuant to Section 13 or 15(d)

Summary of Opening and Closing Balances of Contract Liabilities (Detail)

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Summary of Opening and Closing Balances of Contract Liabilities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Revenue Recognition [Abstract]    
Undelivered elements (training, installation, product and support services) $ 913 $ 835
Extended warranty contracts 1,832 1,753
Total deferred revenue 2,745 2,588
Less long-term portion of deferred revenue (303) (329)
Deferred revenue — current $ 2,442 $ 2,259