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Schedule of Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Schedule of Accrued Liabilities [Line Items]    
Employee compensation $ 9,953 $ 9,560
Taxes 1,024 1,668
Royalty and license fees 242 1,383
Accrued purchases 683 1,191
Warranties 546 598
Professional fees 942 947
Deferred revenue 1,290 960
Other 1,185 1,622
Total accrued liabilities $ 15,865 $ 17,929