Quarterly report pursuant to Section 13 or 15(d)

Components of Accrued Liabilities (Detail)

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Components of Accrued Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Components of accrued liabilities      
Payroll and benefits $ 1,852 $ 1,898  
Warranty accrual, current portion 999 1,096 1,330
Sales and excise tax 410 527  
Accrued professional services 2,004 912  
Accrued insurance premium   428  
Other 432 136  
Total accrued liabilities $ 5,697 $ 4,997