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, 2013
Dec. 31, 2012
Schedule Of Accrued Liabilities [Line Items]    
Payroll and benefits $ 1,703 $ 2,326
Warranty accrual 1,330 1,699
Sales tax 166 640
Accrued professional services 940 502
Accrued insurance premium   751
Other 345 349
Accrued liabilities $ 4,484 $ 6,267