Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Summary of Stock Options Activity) (Details)

v2.4.1.9
Stock-Based Compensation (Summary of Stock Options Activity) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Number of Options  
Outstanding at beginning of period 5,345,764us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Granted 1,169,100us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Outstanding at end of period 6,514,864us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Exercisable at end of period 2,880,199us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Weighted Average Exercise Price  
Outstanding at beginning of period, dollars per share $ 2.16us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Granted, dollars per share $ 1.69us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Outstanding at end of period, dollars per share $ 2.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Exercisable at end of period, dollars per share $ 2.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Weighted Average Remaining Contractual Life (years)  
Outstanding at end of period 7 years 8 months 0 days
Exercisable at end of period 5 years 10 months 15 days
Aggregate Intrinsic Value  
Outstanding at end of period $ 877,344us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Exercisable at end of period $ 534,643us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1