Income Taxes (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating Loss Carryforwards [Line Items]
Statutory federal income tax rate	35.00%	35.00%	35.00%
Reduction of deferred tax asset valuation allowance	$ 6,600,000
Unrecognized tax benefits	1,834,000	1,375,000	816,000	470,000
United States income taxes not provided	84,400,000
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carry-forwards	3,600,000
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carry-forwards	$ 23,000,000