Components of Prepaid Expenses and Other Current Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Disclosure - Components of Prepaid Expenses and Other Current Assets (Detail) [Line Items]
Deferred initial public offering costs	$ 3,909
Settlements receivable from credit card transaction processors	2,535	1,626
Other non-trade receivables from third parties	2,268	24
Prepaid expenses	2,656	1,596
Other current assets	288	162
Total prepaid expenses and other current assets	$ 11,656	$ 3,408