Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 106,488	$ 45,077
Disbursement prefunding	38,313	15,070
Short-term investments	94,698	25,125
Customer funds receivable	23,477	9,318
Prepaid expenses and other current assets	4,244	4,934
Total current assets	267,220	99,524
Noncurrent assets:
Property, equipment, software and intangible assets, net	5,342	3,884
Restricted cash	10,412	9,337
Other assets	967	348
Total assets	283,941	113,093
Current liabilities:
Accounts payable and accrued expenses	9,174	7,150
Customer liabilities	12,721	8,536
Line of credit		15,000
Total current liabilities	21,895	30,686
Non-current liabilities:
Non-current portion of line of credit		25,000
Other non-current liabilities	101	87
Total liabilities	21,996	55,773
Stockholders' equity:
Convertible preferred stock, $0.0001 par value. Authorized 0 and 86,726,665 shares; issued and outstanding 0 and 21,444,251 shares; aggregate liquidation preference $0 and $115,404 at September 30, 2013 and December 31, 2012, respectively		2
Common stock, $0.0001 par value. Authorized 500,000,000 and 135,000,000 shares; issued and outstanding 37,358,411 and 5,083,616 shares at September 30, 2013 and December 31, 2012, respectively	4	1
Additional paid-in capital	320,137	120,684
Accumulated other comprehensive income (loss)	(5)	(1)
Accumulated deficit	(58,191)	(63,366)
Total stockholders' equity	261,945	57,320
Total liabilities and stockholders' equity	$ 283,941	$ 113,093