Annual report pursuant to Section 13 and 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
Dec. 31, 2019
Dec. 31, 2018
Revenue Recognition [Abstract]    
Undelivered elements (training, installation, product and support services) $ 559 $ 730
Extended warranty contracts 2,063 1,735
Deferred royalties   11
Total deferred revenue 2,622 2,476
Less: long-term portion of deferred revenue 385  
Deferred revenue – current $ 2,237 $ 2,476