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Summary of Accounts Payable and Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounts Payable and Accrued Liabilities [Line Items]
Accounts payable	$ 1,411	$ 1,076
Accrued processing and disbursement costs	1,720	1,055
Accrued marketing expense	1,448	708
Other accrued expenses	3,657	4,311
Accounts payable and accrued expenses	$ 8,236	$ 7,150	$ 5,137

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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