Quarterly report pursuant to Section 13 or 15(d)

ACCRUED LIABILITIES AND DEFERRED REVENUE - Components of Accrued Liabilities (Detail)

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ACCRUED LIABILITIES AND DEFERRED REVENUE - Components of Accrued Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Dec. 31, 2010
Components of accrued liabilities [Line Items]            
Payroll and benefits $ 1,801   $ 1,928      
Warranty accrual 1,930 1,980 2,218 2,832 2,686 2,725
Sales tax 481   526      
Accrued professional services 646   669      
Accrued insurance premium 0   433      
Accrued support services 0   200      
Other 183   203      
Accrued liabilities $ 5,041   $ 6,177