Quarterly Financial Information (Unaudited) (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010
Summary of Balance Sheet
Cash and cash equivalents	$ 9,903	$ 6,897	$ 10,515	$ 7,233	$ 8,505	$ 9,053	$ 8,510	$ 8,304	$ 10,814
Accounts receivable, net	16,095	16,586	15,013	17,714	13,403	16,476	13,393	15,792
Total current assets	36,978	36,972	36,442	36,077	33,328	34,363	36,525	37,016
Long-term investments						116	116	122
Total assets	45,791	45,332	45,826	45,491	42,792	44,939	41,627	42,106
Third-party software fees payable	11,099	10,763	10,683	10,844	8,460	10,101	9,121	11,148
Accounts payable	553	202	338	766	695	373	372	541
Other accrued expenses	1,732	2,490	2,666	2,022	2,330	3,949	1,701	1,436
Accrued compensation	2,205	1,956	2,429	2,263	2,645	2,062	2,207	1,636
Total current liabilities	16,426	16,979	17,906	17,724	15,363	17,469	14,917	16,094
Common stock	128,474	128,123	128,203	127,797	127,318	126,682	126,032	125,282
Accumulated deficit	(98,736)	(99,432)	(100,042)	(99,840)	(99,652)	(99,150)	(98,984)	(99,005)
Total shareholders' equity	29,005	27,791	27,531	27,374	27,035	26,915	26,505	25,789	25,082
Total liabilities and shareholders' equity	$ 45,791	$ 45,332	$ 45,826	$ 45,491	$ 42,792	$ 44,939	$ 41,627	$ 42,106