Consolidated Balance Sheets - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 13,849,551	$ 14,675,515
Restricted cash	4,930,965	5,050,147
Accounts receivable, net of allowances of $0.2 million as of March 31, 2016 and $0.1 million as of December 31, 2015	6,636,151	6,406,496
Prepaid expenses and other assets	2,006,621	1,800,566
Total current assets	27,423,288	27,932,724
Other assets:
Restricted cash	551,869	551,917
Property and equipment, net	1,821,977	1,811,619
Software development costs, net	3,972,881	3,964,454
Intangible assets, net	1,262,080	1,378,264
Goodwill	298,655	286,852
Deferred tax asset and other long-term assets	8,456,296	8,581,082
Total other assets	16,363,758	16,574,188
Total assets	43,787,046	44,506,912
Current liabilities:
Accounts payable	450,016	306,520
Accrued expenses	6,297,607	6,438,600
Due to merchants	5,117,988	5,240,427
Current portion of capital leases	270,968	290,911
Total current liabilities	12,136,579	12,276,458
Long-term liabilities:
Other long-term liabilities	1,514,429	1,666,938
Total long-term liabilities	1,514,429	1,666,938
Total liabilities	$ 13,651,008	$ 13,943,396
Commitments and contingencies (Note 8)
Stockholders' equity:
Convertible preferred stock-10,000,000 shares authorized as of March 31, 2016 and December 31, 2015, $0.01 par value: Series A-2,243,750 issued and outstanding as of March 31, 2016 and December 31, 2015; $8,975,000 aggregate liquidation preference	$ 22,438	$ 22,438
Common stock-250,000,000 shares authorized as of March 31, 2016 and December 31, 2015, $0.01 par value, and 56,525,013 issued and 51,633,574 shares outstanding as of March 31, 2016, and 56,191,389 issued and 52,585,503 shares outstanding as of December 31, 2015	565,250	561,914
Treasury stock, at cost, 4,891,439 shares and 3,605,886 shares as of March 31, 2016 and December 31, 2015, respectively	(11,504,517)	(7,883,012)
Additional paid-in capital	108,098,582	106,741,026
Accumulated other comprehensive loss	(437,615)	(510,445)
Accumulated deficit	(66,608,100)	(68,368,405)
Total stockholders' equity	30,136,038	30,563,516
Total liabilities and stockholders' equity	$ 43,787,046	$ 44,506,912