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Income Taxes (Details Textual) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Loss Carryforwards [Line Items]      
Valuation allowance for deferred tax assets     $ 7,252
Income Taxes (Textual) [Abstract]      
US statutory rate 34.00% 34.00%  
Long-term deferred tax assets 2,565 2,874  
Current deferred tax liabilities 543 269  
U.S. tax deductions for employee stock option gains, the tax benefit 9,093    
Expiry Date of Operating Loss carryforward 2022 to 2032    
US NOL carryforwards 11,620    
Foreign NOL carryforwards 5,279    
Other Foreign Deductible carryforwards 3,491    
Expiry Date of other deductible carryforwards 2016 to 2019    
Tax benefit of utilized U.S. NOL carryforwards 5,468 1,557 2,606
Net change in the valuation allowance 196 5,625 550
Valuation allowance reduction 0    
Unremitted foreign earnings estimated 108,000    
Accrued interest or penalties for income tax liabilities 0    
Intellectual property reserve 560 470  
Foreign Tax Authority [Member]
      
Operating Loss Carryforwards [Line Items]      
Valuation allowance for deferred tax assets $ 2,284