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
Jun. 30, 2021
Dec. 31, 2020
Revenue Recognition [Abstract]    
Undelivered elements (training, installation, product and support services) $ 813 $ 670
Extended warranty contracts 1,576 1,609
Total deferred revenue 2,389 2,279
Less long-term portion of deferred revenue (333) (374)
Deferred revenue — current $ 2,056 $ 1,905