13. Note Receivable

On October 1, 2018, the Company completed the sale of its spine business to CTL Medical. The sale included a $6 million noninterest bearing note receivable. The 36-month term of the note receivable requires 18 payments of $138,889 followed by 18 payments of $194,444, with maturing of the note receivable on October 1, 2021. The note receivable includes an imputed interest rate of 10%, which totaled $915,725 as of October 31, 2018, and has a 36-month amortization. As of December 31, 2019, the net carrying value of the note receivable was $3.7 million.