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Stock-Based Compensation (Details 2) (USD $)
12 Months Ended
Dec. 31, 2013
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]  
Exercisable, Number of Shares 10,031,605
Exercisable, Weighted-Average Exercise Price $ 0.30
Exercisable, Weighted-Average Remaining Contractual Term 7 years 2 months 23 days
Vested and expected to vest, Number of Shares 18,788,438
Vested and expected to vest, Weighted-Average Exercise Price $ 0.26
Vested and expected to vest, Weighted-Average Remaining Contractual Term 7 years 11 months 8 days