Quarterly report pursuant to Section 13 or 15(d)

Stock options and warrants (Schedule of Award Activity) (Details)

v2.4.0.8
Stock options and warrants (Schedule of Award Activity) (Details) (USD $)
6 Months Ended
Jun. 30, 2014
Shares Underlying Options  
Exercised (39,079)
Stock Incentive Plan [Member]
 
Shares Underlying Options  
Outstanding, beginning 1,218,265
Granted 652,100
Exercised (39,079)
Forfeited (36,040)
Outstanding, ending 1,795,246
Exercisable 1,134,621
Weighted Average Exercise Price  
Outstanding, beginning $ 8.70
Granted $ 2.28
Exercised $ 2.09
Forfeited $ 32.29
Outstanding, ending $ 6.04
Exercisable $ 8.17
Weighted Average Remaining Contractual Term  
Outstanding 8 years 6 months
Exercisable 8 years 1 month 6 days
Aggregate Intrinsic Value  
Outstanding $ 164,154
Exercisble 140,863
Nonqualified [Member]
 
Shares Underlying Options  
Outstanding, beginning 4,622,505
Granted   
Exercised (1,161,570)
Forfeited (5,000)
Outstanding, ending 3,455,935
Weighted Average Exercise Price  
Outstanding, beginning $ 1.82
Granted   
Exercised $ 1.36
Forfeited $ 30.00
Outstanding, ending $ 1.93
Weighted Average Remaining Contractual Term  
Outstanding 3 years 9 months 18 days
Aggregate Intrinsic Value  
Outstanding $ 2,491,184