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Stock-Based Compensation (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Range of Exercise Price 0.09-2.00 [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit $ 0.09 $ 0.09
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit $ 2.00 $ 2.00
Options Outstanding, Options 2,093,196 2,162,362
Options Outstanding, Weighted Average Exercise Price $ 1.29 $ 1.78
Options Outstanding, Weighted Average Remaining Contractual Life 4 years 8 months 23 days 5 years 9 months 4 days
Options Exercisable, Options 1,901,737 1,801,187
Options Exercisable, Weighted Average Exercise Price $ 1.25 $ 1.14
Options Exercisable, Weighted Average Remaining Contractual Life 4 years 7 months 20 days 5 years 6 months 7 days
Range of Exercise Price 2.01-3.00 [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit $ 2.01 $ 2.01
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit $ 3.00 $ 3.00
Options Outstanding, Options 1,770,560 2,212,227
Options Outstanding, Weighted Average Exercise Price $ 2.28 $ 2.26
Options Outstanding, Weighted Average Remaining Contractual Life 6 years 7 months 24 days 7 years 1 month 24 days
Options Exercisable, Options 1,205,976 1,011,533
Options Exercisable, Weighted Average Exercise Price $ 2.26 $ 2.17
Options Exercisable, Weighted Average Remaining Contractual Life 6 years 3 months 6 years 1 month 20 days
Range of Exercise Price 3.01-6.00 [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit $ 3.01 $ 3.01
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit $ 6.00 $ 6.00
Options Outstanding, Options 45,824 79,157
Options Outstanding, Weighted Average Exercise Price $ 5.24 $ 4.87
Options Outstanding, Weighted Average Remaining Contractual Life 3 years 7 months 13 days 4 years 5 months 26 days
Options Exercisable, Options 45,824 79,157
Options Exercisable, Weighted Average Exercise Price $ 5.24 $ 4.87
Options Exercisable, Weighted Average Remaining Contractual Life 3 years 7 months 13 days 4 years 5 months 26 days
Range of Exercise Price 0.09-6.00 [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit $ 0.09 $ 0.09
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit $ 6.00 $ 6.00
Options Outstanding, Options 3,909,580 4,453,746
Options Outstanding, Weighted Average Exercise Price $ 1.78 $ 1.78
Options Outstanding, Weighted Average Remaining Contractual Life 5 years 7 months 2 days 6 years 5 months 5 days
Options Exercisable, Options 3,153,537 2,891,877
Options Exercisable, Weighted Average Exercise Price $ 1.69 $ 1.60
Options Exercisable, Weighted Average Remaining Contractual Life 5 years 2 months 26 days 5 years 8 months 16 days