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Stock Based Compensation - Summary of Stock Option Activity (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Stock Options    
Options, Outstanding 6,124,703us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Granted 8,003,874us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross  
Exercised 0cak_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedInPeriod  
Forfeited (353,046)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod  
Options, Outstanding 13,775,531us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 6,124,703us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Expected to vest 13,775,531us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber  
Exercisable at December 31, 2013 3,376,648us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber  
Options Outstanding, Weighted-Average Exercise Price $ 0.37us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice  
Granted $ 0.28us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice  
Exercised $ 0us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice  
Forfeited $ 0.69us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice  
Options Outstanding, Weighted-Average Exercise Price $ 0.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 0.37us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Expected to vest $ 0.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice  
Exercisable at December 31, 2013 $ 0.37us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice  
Options Outstanding, Weighted-Average Remaining Contractual Term (Years) 3 years 8 months 12 days 3 years 6 months
Granted 4 years 3 months 18 days  
Options Outstanding, Weighted-Average Remaining Contractual Term (Years) 3 years 8 months 12 days 3 years 6 months
Expected to vest 3 years 8 months 12 days  
Exercisable at December 31, 2013 2 years 8 months 12 days