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Zimmer Development Agreement (Tables)
3 Months Ended
Dec. 31, 2021
Zimmer Development Agreement [Abstract]  
Schedule of deferred revenue
   2021   2020 
Deferred Revenue        
Balance as of beginning of period – September 30  $8,622   $73,434 
Revenue recognized   (6,374)   (22,274)
Balance as of end of period – December 31  $2,248   $51,160