Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net loss	$ (79)	$ (494)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	778	424
Depreciation and amortization	462	262
Accretion of discounts/amortization of premium on investments	160	136
Amortization of warrant issuance costs	28
Changes in operating assets and liabilities:
Disbursement prefunding	1,194	(852)
Customer funds receivable	(28,641)	(7,173)
Prepaid expenses and other current assets	1,720	(1,137)
Other assets	49
Customer liabilities	16,558	2,151
Transaction loss reserves	(38)	(46)
Accounts payable and accrued expenses	840	273
Other non-current liabilities	9
Net cash used in operating activities	(6,960)	(6,456)
Cash flows from investing activities:
Purchase of property, equipment and software	(395)	(1,062)
Purchase of marketable securities	(33,873)	(9,965)
Proceeds from sales and maturities of marketable securities	7,291	3,814
Change in restricted cash	(1,012)	(2,000)
Net cash used in investing activities	(27,989)	(9,213)
Cash flows from financing activities:
Net proceeds from issuance of preferred stock		(5)
Proceeds from exercise of common stock options	400	25
Net borrowings under line of credit	(15,000)	(1,500)
Proceeds from initial public offering, net of costs	88,527
Net cash provided by (used in) financing activities	73,927	(1,480)
Net increase (decrease) in cash and cash equivalents	38,978	(17,149)
Cash and cash equivalents, beginning of period	45,077	48,248
Cash and cash equivalents, end of period	84,055	31,099
Supplemental disclosures of cash flow information:
Cash paid for taxes	2	2
Cash paid for interest	334	157
Purchases of property and equipment in accounts payable and accrued expenses	36	352
Deferred offering costs not yet paid	$ 185