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Stock-Based Compensation (Details 4) (Warrant [Member], USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Warrant [Member]
    
Summary of all stock option plans / warrant activity    
Weighted Average Number of Shares/Warrants, Outstanding, Beginning Balance 4,704,636 5,405,606
Warrants, Issued      
Warrants, Expired/forfeited    (232)
Warrants Exercised (3,876,063) (700,738)
Weighted Average Number of Shares/Warrants, Outstanding, Ending Balance 828,573 4,704,636
Weighted Average Exercise Price, Outstanding, Beginning Balance $ 1.61 $ 1.57
Weighted Average Exercise Price, Issued      
Weighted Average Exercise Price, Expired/forfeited    $ 31.75
Weighted Average Exercise Price, Exercised $ 1.45 $ 1.18
Weighted Average Exercise Price, Outstanding, Ending Balance $ 2.39 $ 1.61
Weighted Average Remaining Contractual Life (years) Options Outstanding 1 year 4 months 28 days 2 years 5 months 12 days
Weighted Average Remaining Contractual Life, Issued 0 years 0 years
Weighted Average Remaining Contractual Life, Expired and forfeited 0 years 0 years
Weighted Average Remaining Contractual Life, Exercised 0 years 0 years
Weighted Average Remaining Contractual Life (years) Options Outstanding 2 years 0 months 22 days 1 year 4 months 28 days