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Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Accrued Liabilities [Line Items]
Payroll and employee benefits	$ 2,793	$ 1,211
Sales and marketing	4,896	5,649
Other accrued liabilities	576	509
Accrued Liabilities, Total	$ 8,265	$ 7,369

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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