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Stock options and warrants (Tables)
3 Months Ended
Mar. 31, 2013
Stock Options [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share Based Compensation Employees and Consultants
   
2013
   
2012
 
             
Stock options to employees and directors
 
$
483,625
   
$
197,402
 
Stock options to consultants for:
               
Investor relations activities
   
-
     
20,227
 
APPY1 activities
   
597
     
1,491
 
Animal health activities
   
-
     
2,876
 
                 
Total stock-based compensation
 
$
484,222
   
$
221,996
 
Schedule of Stock Based Compensation Expenses
   
Three Months Ended
 
   
2013
   
2012
 
             
Selling, general and administrative expenses
 
$
483,625
   
$
220,505
 
Research and development expenses
   
597
     
1,491
 
                 
Total stock-based compensation
 
$
484,222
   
$
221,996
Stock Incentive Plan Options [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Assumptions Used in the Estimation of Fair Value of Stock Based Compensation
     
2013
 
         
Dividend yield
     
0%
 
Expected price volatility
     
127-128%
 
Risk free interest rate
     
0.72-0.76 %
 
Expected term
   
5 years
 
Schedule of Share-based Compensation, Employee Incentive Plan, Activity
   
Shares
Underlying
Options
   
Weighted
Average
Exercise
Price
   
Weighted
Average
Remaining
Contractual
Term (Years)
   
Aggregate
Intrinsic
Value
 
                         
Outstanding at January 1, 2013
   
707,940
   
$
13.98
             
Granted
   
474,270
     
2.09
             
Exercised
   
-
     
-
             
Forfeited
   
(6,644
)
   
2.43
             
                             
Outstanding at March 31, 2013
   
1,175,566
   
$
9.25
     
9.05
   
$
85,200
 
                                 
Exercisable at March 31, 2013
   
261,506
   
$
33.15
     
6.72
   
$
10,400
Schedule of Nonvested Share Activity
Nonvested Shares
 
Nonvested
Shares
Underlying
Options
   
Weighted
Average
Exercise
Price
   
Weighted
Average
Grant Date
Fair Value
 
                   
Nonvested at January 1, 2013
   
508,435
   
$
3.70
   
$
3.07
 
Granted
   
474,270
     
2.09
     
1.78
 
Vested
   
(62,001
)
   
10.55
     
8.58
 
Forfeited
   
(6,644
)
   
2.43
     
2.04
 
                         
Nonvested at March 31, 2013
   
914,060
   
$
2.41
   
$
2.03
 
Other Options and Warrants [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Nonvested Share Activity
Nonvested Shares
 
Nonvested
Shares
Underlying
Options
   
Weighted
Average
Exercise
Price
   
Weighted
Average
Grant Date
Fair Value
 
                   
Nonvested at January 1, 2013
   
8,332
   
$
3.42
   
$
2.84
 
Granted
   
-
     
-
     
-
 
Vested
   
(5,000
)
   
3.42
     
2.84
 
Forfeited
   
-
     
-
     
-
 
                         
Nonvested at March 31, 2013
   
3,332
   
$
3.42
   
$
2.84
Summary of Stock Option Activity Under Stock Option and Incentive Plans
   
Shares
Underlying
Options / Warrants
   
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term (Years)
   
Aggregate
Intrinsic
Value
                         
Outstanding at January 1, 2013
   
598,507
   
$
5.01
         
Granted
   
-
     
-
         
Exercised
   
-
     
-
         
Forfeited
   
(501
)
   
54.00
         
                         
Outstanding at March 31, 2013
   
598,006
   
$
4.97
 
4.37
 
$
-
                         
Exercisable at March 31, 2013
   
289,673
   
$
7.59
 
4.47
 
$
-