Share-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended						3 Months Ended		12 Months Ended	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Service-Based Options [Member]	Mar. 31, 2012 Service-Based Options [Member]	Mar. 31, 2012 2012 Performance Options [Member]	Jan. 10, 2013 2012 Performance Options [Member]	Mar. 31, 2013 Market Condition Options [Member]	Mar. 31, 2012 Market Condition Options [Member]	Dec. 31, 2009 Market Condition Options [Member]	Mar. 31, 2013 Stock Options [Member]	Mar. 31, 2012 Stock Options [Member]	Mar. 31, 2013 2013 Performance Options [Member]	Mar. 31, 2013 Cost of revenues [Member]	Mar. 31, 2012 Cost of revenues [Member]	Mar. 31, 2013 Sales and marketing [Member]	Mar. 31, 2012 Sales and marketing [Member]	Mar. 31, 2013 Technology support [Member]	Mar. 31, 2012 Technology support [Member]	Mar. 31, 2013 General and administrative [Member]	Mar. 31, 2012 General and administrative [Member]
Share-based Compensation [Abstract]
Share-based compensation costs	$ 186	$ 282											$ 12	$ 12	$ 35	$ 92	$ 60	$ 92	$ 79	$ 86
Amount capitalized to internal use software	0	1
Total share-based compensation costs	$ 186	$ 281
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)			57,000	19,400	249,199				213,650			87,117
Options weighted average grant date fair value (in dollars per share)			$ 2.19	$ 2.41	$ 2.39				$ 0.97			$ 2.19
Options weighted average exercise price (in dollars per share)			$ 4.01	$ 3.93					$ 1.75
Proportion of options vested on first anniversary of grant date			0.33333
Period over which options are granted ratably (in months)			24
Number of vesting conditions					2							2
Performance options vested (in shares)						161,394
Stock options exercised (in shares)							4,000	930		8,000	1,606
Options exercised weighted average exercise price (in dollars per share)										$ 2.43	$ 2.32
Fair value of stock options granted using the following weighted average assumptions [Abstract]
Dividend yield (in hundredths)	0.00%	0.00%
Volatility (in hundredths)	72.00%	84.00%
Risk-free interest rate (in hundredths)	0.60%	0.70%
Expected life (years)	4 years 3 months 18 days	4 years 2 months 12 days