Significant Accounting Policies (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2011 Y Contract	Dec. 31, 2010 Y	Dec. 31, 2009
Adjusted Capital Requirements and Customer Protection Requirements [Line Items]
Provision for bad debts	$ 1,177,000	$ 602,000	$ 652,000
Significant Accounting Policies (Textual) [Abstract]
Maximum maturity period for classification of investments as cash equivalents	3 months
Investments other-than-temporary losses	0	0	0
Number of foreign currency forward contracts	1
Allowance for doubtful accounts	1,086,000	427,000	900,000
Percentage of allowance against outstanding receivables	100.00%
Write-offs and other charges against the allowance for doubtful accounts	200,000	700,000	600,000
Estimated life of fixed assets, Minimum	3
Estimated life of fixed assets, Maximum	7
Period of amortization of software development costs	3
Contract loss provisions recorded	0	0
Term of agreement for revenue recognition	2 years
Estimated life of intangible assets, Minimum	5
Estimated life of intangible assets, Maximum		10
Mf Global Inc [Member]
Adjusted Capital Requirements and Customer Protection Requirements [Line Items]
Provision for bad debts	$ 900,000