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
Jun. 30, 2013
Dec. 31, 2012
Schedule Of Accrued Liabilities [Line Items]    
Payroll and benefits $ 1,841 $ 2,326
Warranty accrual 1,518 1,699
Sales tax 384 640
Accrued professional services 740 502
Accrued insurance premium 141 751
Other 460 349
Accrued liabilities $ 5,084 $ 6,267