Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 98,137	$ 110,979
Disbursement prefunding	40,299	33,799
Short-term investments	107,851	104,678
Customer funds receivable	25,065	16,381
Prepaid expenses and other current assets	5,288	4,237
Total current assets	276,640	270,074
Non-current assets:
Property, equipment and software, net	7,493	4,855
Goodwill	9,032
Intangibles, net	5,543	250
Restricted cash	10,969	7,816
Other assets	2,164	1,084
Total assets	311,841	284,079
Current liabilities:
Accounts payable and accrued expenses	10,212	8,345
Customer liabilities	21,392	10,791
Total current liabilities	31,604	19,136
Non-current liabilities:
Other non-current liabilities	3,019	99
Total liabilities	34,623	19,235
Commitments and Contingencies (Note 12)
Stockholders' equity:
Convertible preferred stock, $0.0001 par value, 25,000,000 shares authorized; issued and outstanding 0 shares; aggregate liquidation preference $0 at June 30, 2014 and December 31, 2013
Common stock, $0.0001 par value, 500,000,000 shares authorized; issued and outstanding 38,183,373 and 37,583,945 shares at June 30, 2014 and December 31, 2013, respectively	4	4
Additional paid-in capital	332,511	321,878
Accumulated other comprehensive loss	(9)
Accumulated deficit	(55,288)	(57,038)
Total stockholders' equity	277,218	264,844
Total liabilities and stockholders' equity	$ 311,841	$ 284,079