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, 2013
Dec. 31, 2012
Components of accrued liabilities [Line Items]    
Payroll and benefits $ 1,613 $ 2,326
Warranty accrual 1,755 1,699
Sales tax 421 640
Accrued professional services 650 502
Accrued insurance premium 326 751
Other 114 349
Accrued liabilities $ 4,879 $ 6,267