Consolidated Balance Sheets (USD $)	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 6,002,457	$ 7,671,963
Restricted cash	2,517,616	1,941,909
Accounts receivable, net of allowances of $1.5 million and $1.4 million, respectively, as of December 31, 2012 and 2011	5,585,815	4,768,040
Prepaid expenses and other assets	2,395,137	947,043
Total current assets	16,501,025	15,328,955
Other assets:
Restricted cash	669,406	659,958
Property and equipment, net	1,396,154	1,223,562
Software development costs, net	4,776,320	4,978,002
Intangible assets, net	3,289,590	799,648
Goodwill	347,599
Security deposits and other assets	338,408	213,230
Deferred IPO costs		1,650,789
Total other assets	10,817,477	9,525,189
Total assets	27,318,502	24,854,144
Current liabilities:
Accounts payable	889,118	993,872
Accrued expenses	5,298,789	2,482,255
Due to merchants	2,546,140	2,137,064
Current portion of capital leases	337,588	247,257
Total current liabilities	9,071,635	5,860,448
Long-term liabilities:
Long-term portion of capital leases and other long-term liabilities	364,010	248,730
Total long-term liabilities	364,010	248,730
Total liabilities	9,435,645	6,109,178
Commitments and contingencies (Note 8)
Stockholders' equity:
Convertible preferred stock-10,000,000 shares authorized as of December 31, 2012 and 4,000,000 shares authorized as of December 31, 2011, $0.01 par value: Series A-2,243,750 issued and outstanding as of December 31, 2012 and 2011; $8,975,000 aggregate liquidation preference	22,438	22,438
Common stock-250,000,000 shares authorized as of December 31, 2012 and 80,000,000 shares authorized as of December 31, 2011, $0.01 par value, and 53,658,857 and 51,764,405 shares issued and outstanding as of December 31, 2012 and 2011, respectively	536,589	517,644
Additional paid-in capital	97,576,498	94,083,901
Warrants	1,622,651	1,622,651
Accumulated other comprehensive gain (loss)	37,925	(40,729)
Accumulated deficit	(81,913,244)	(77,460,939)
Total stockholders' equity	17,882,857	18,744,966
Total liabilities and stockholders' equity	$ 27,318,502	$ 24,854,144