Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 84,055	$ 45,077
Disbursement prefunding	13,876	15,070
Short-term investments	51,537	25,125
Customer funds receivable	37,959	9,318
Prepaid expenses and other current assets	3,186	4,934
Total current assets	190,613	99,524
Noncurrent assets:
Property, equipment and software, net	3,807	3,884
Restricted cash	10,349	9,337
Other assets	299	348
Total assets	205,068	113,093
Current liabilities:
Accounts payable and accrued expenses	7,942	7,150
Customer liabilities	25,094	8,536
Line of credit		15,000
Total current liabilities	33,036	30,686
Non-current liabilities:
Non-current portion of line of credit	25,000	25,000
Other non-current liabilities	96	87
Total liabilities	58,132	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 March 31, 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 32,940,948 and 5,083,616 shares at March 31, 2013 and December 31, 2012, respectively	3	1
Additional paid-in capital	210,389	120,684
Accumulated other comprehensive income (loss)	(11)	(1)
Accumulated deficit	(63,445)	(63,366)
Total stockholders' equity	146,936	57,320
Total liabilities and stockholders' equity	$ 205,068	$ 113,093