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, 2020
Dec. 31, 2019
Revenue Recognition [Abstract]    
Undelivered elements (training, installation, product and support services) $ 521 $ 559
Extended warranty contracts 1,377 2,063
Total deferred revenue 1,898 2,622
Less long-term portion of deferred revenue 412 385
Deferred revenue — current $ 1,486 $ 2,237