Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Provision for bad debts	$ 519,000	$ 1,177,000	$ 602,000
Estimated life of intangible assets	3 years
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
Contractual maturities accounts receivable	less than one year
Allowance for doubtful accounts	75,000	1,086,000	400,000
Percentage of allowance against outstanding receivables	100.00%
Write-offs and other charges against the allowance for doubtful accounts	1,400,000	200,000	700,000
Contract loss provisions recorded	0	0	0
Term of agreement for revenue recognition	2 years
Forward Contracts [Member]
Property, Plant and Equipment [Line Items]
Number of foreign currency contracts	1
Foreign Exchange Option [Member]
Property, Plant and Equipment [Line Items]
Number of foreign currency contracts	1
MF GLOBAL INC [Member]
Property, Plant and Equipment [Line Items]
Provision for bad debts	$ 900,000
Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated life of fixed assets	7 years
Estimated life of intangible assets	10 years
Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated life of fixed assets	3 years
Estimated life of intangible assets	5 years