Summary of Accounts Payable and Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Payables And Accruals [Abstract]
Accounts Payable Current	$ 1,690	$ 711
Accrued processing and disbursement costs	2,103	2,120
Accrued marketing expense	1,189	1,940
Other accrued expenses	5,230	3,574
Accounts payable and accrued expenses	$ 10,212	$ 8,345