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12. WARRANTS
 12 Months Ended
Sep. 30, 2018
Warrants Abstract  
WARRANTS

Transactions involving our equity-classified warrants are summarized as follows:

 

    Number of shares     Weighted-average exercise price    

Weighted-

average remaining contractual term (in years)

     Aggregate intrinsic value (in thousands)  
Outstanding at September 30, 2016     70,067     $ 4.47              
Issued     212,176       6.53              
Exercised     (70,067 )     4.47              
Forfeited     —       —              
Outstanding at September 30, 2017     212,176       6.53              
Issued     100,000       7.50              
Exercised     —       —              
Forfeited     —       —              
Outstanding at September 30, 2018     312,176     $ 6.84       3.5     $ —  
                                 
Exercisable at September 30, 2018     312,176     $ 6.84       3.5     $ —  

 

The following table summarizes outstanding common stock purchase warrants as of September 30, 2018:

 

    Number of shares     Weighted-average exercise price  

Expiration

               
Exercisable at $7.80 per share     141,676     $ 7.80   September 2021
Exercisable at $7.50 per share     100,000     $ 7.50   October 2022
Exercisable at $4.00 per share     70,500     $ 4.00   September 2022
      312,176       6.84