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12. Warrants (Tables)
12 Months Ended
Sep. 30, 2017
Warrants and Rights Note Disclosure [Abstract]  
Warrant activity
   Number of
units - Series B
Convertible
preferred
warrants
   Weighted
Average
Exercise
Price
   Weighted
Average
Remaining
Contractual
Term
(in years)
   Intrinsic
Value
 
Outstanding at September 30, 2017   118,029   $20.80    0.91   $4,862,230 
Exercisable at September 30, 2017   118,029   $20.80    0.91   $4,862,230 
Warrants outstanding and exercisable
Series B Convertible Preferred 
Outstanding   Exercisable 
Number of Warrants   Exercise
Price
   Number of Warrants   Exercise
Price
 
 54,396   $16.60    54,396   $16.60 
 17,857    16.80    17,857    16.80 
 12,383    24.30    12,383    24.30 
 33,393    28.50    33,393    28.50 
 118,029         118,029