Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Summary of Opening and Closing Balances of Contract Liabilities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Revenue Recognition [Abstract]    
Undelivered elements (training and product and support services; installation for 2017) $ 583 $ 980
Extended warranty contracts 1,592 1,634
Deferred royalties 20 22
Total deferred revenue 2,195 2,636
Less long-term amounts:    
Deferred royalties 8 11
Total deferred revenue - long-term 8 11
Total deferred revenue - current $ 2,187 $ 2,625