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
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Components of accrued liabilities      
Payroll and benefits $ 1,594 $ 1,898  
Warranty accrual, current portion 1,025 1,096 1,755
Sales and excise tax 163 322  
Accrued professional services 1,366 912  
Accrued insurance premium 276 428  
Other 517 341  
Total accrued liabilities $ 4,941 $ 4,997