Consolidated balance sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 6,572,468	$ 6,002,457
Restricted cash	3,471,023	2,517,616
Accounts receivable, net of allowances of $0.2 million and $1.5 million, as of December 31, 2013 and 2012, respectively	6,016,296	5,585,815
Prepaid expenses and other assets	1,457,660	2,395,137
Total current assets	17,517,447	16,501,025
Other assets:
Restricted cash	446,044	669,406
Property and equipment, net	2,198,640	1,396,154
Software development costs, net	4,904,415	4,776,320
Intangible assets, net	2,820,909	3,289,590
Goodwill	362,063	347,599
Security deposits and other assets	2,141,620	338,408
Total other assets	12,873,691	10,817,477
Total assets	30,391,138	27,318,502
Current liabilities:
Accounts payable	585,604	889,118
Accrued expenses	5,032,620	5,298,789
Due to merchants	3,018,900	2,546,140
Current portion of capital leases	466,010	337,588
Total current liabilities	9,103,134	9,071,635
Long-term liabilities:
Long-term portion of capital leases and deferred revenue	1,432,513	364,010
Total long-term liabilities	1,432,513	364,010
Total liabilities	10,535,647	9,435,645
Commitments and contingencies (Note 8)
Stockholders' equity:
Convertible preferred stock-10,000,000 shares authorized as of December 31, 2013 and 2012, $0.01 par value: Series A-2,243,750 issued and outstanding as of December 31, 2013 and 2012; $8,975,000 aggregate liquidation preference	22,438	22,438
Common stock-250,000,000 shares authorized as of December 31, 2013 and 2012, $0.01 par value, and 55,037,488 and 53,658,857 shares issued and outstanding as of December 31, 2013 and 2012, respectively	550,375	536,589
Additional paid-in capital	101,038,685	99,199,149
Accumulated other comprehensive income	135,231	37,925
Accumulated deficit	(81,891,238)	(81,913,244)
Total stockholders' equity	19,855,491	17,882,857
Total liabilities and stockholders' equity	$ 30,391,138	$ 27,318,502