Condensed Consolidated Balance Sheets (USD $)	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 5,313,971	$ 6,002,457
Restricted cash	2,052,545	2,517,616
Accounts receivable, net of allowances of $0.2 million as of June 30, 2013 and $1.5 million December 31, 2012	5,589,554	5,585,815
Prepaid expenses and other assets	1,896,573	2,395,137
Total current assets	14,852,643	16,501,025
Other assets:
Restricted cash	669,406	669,406
Property and equipment, net	2,186,276	1,396,154
Software development costs, net	5,013,802	4,776,320
Intangible assets, net	2,925,065	3,289,590
Goodwill	342,208	347,599
Security deposits and other assets	945,792	338,408
Total other assets	12,082,549	10,817,477
Total assets	26,935,192	27,318,502
Current liabilities:
Accounts payable	1,119,542	889,118
Accrued expenses	3,019,662	5,298,789
Due to merchants	1,934,710	2,546,140
Current portion of capital leases liability	450,644	337,588
Total current liabilities	6,524,558	9,071,635
Long-term liabilities:
Long-term portion of capital leases liability and other long-term liabilities	1,060,681	364,010
Total long-term liabilities	1,060,681	364,010
Total liabilities	7,585,239	9,435,645
Commitments and contingencies (Note 10)
Stockholders' equity:
Convertible preferred stock-10,000,000 shares authorized as of June 30, 2013 and December 31, 2012, $0.01 par value: Series A - 2,243,750 issued and outstanding as of June 30, 2013 and December 31, 2012; $8,975,000 aggregate liquidation preference	22,438	22,438
Common stock-250,000,000 shares authorized as of June 30, 2013 and December 31, 2012, $0.01 par value, and 54,483,340 and 53,658,857 issued and outstanding as of June 30, 2013 and December 31, 2012, respectively	544,833	536,589
Additional paid-in capital	100,059,732	99,199,149
Accumulated other comprehensive (loss) gain	(40,413)	37,925
Accumulated deficit	(81,236,637)	(81,913,244)
Total stockholders' equity	19,349,953	17,882,857
Total liabilities and stockholders' equity	$ 26,935,192	$ 27,318,502