Annual report pursuant to Section 13 and 15(d)

Components of Accrued Liabilities (Detail)

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Components of Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Components of accrued liabilities      
Payroll and benefits $ 2,115 $ 2,147  
Warranty accrual, current portion 1,120 933 $ 1,345
Taxes 544 638  
Accrued professional services 584 782  
Accrued capital lease, current portion   159  
Accrued insurance premium 870 906  
Other 376 213  
Accrued liabilities $ 5,609 $ 5,778