Debt	3 Months Ended
Mar. 31, 2019
Debt Disclosure [Abstract]
Debt	(7) Debt In December 2013, the Company entered into a promissory note agreement with its former Chairman of the Board and one of its major shareholders pursuant to which the Company borrowed $500,000 (the 2013 Promissory Note). The 2013 Promissory Note is unsecured and bears interest at 6% per annum and was originally due on June 30, 2014. According to the terms of the 2013 Promissory Note, at any time, the lenders may settle any or all of the principal and accrued interest with shares of the Company’s common stock. In connection with the 2013 Promissory Note, each of the two lenders was issued 5,000,000 warrants to purchase shares of the Company’s common stock at $0.06 per share. The warrants were immediately exercisable. In June 2014, the Company renegotiated the terms of the 2013 Promissory Note. Pursuant to the modification, the maturity date was extended to December 31, 2017 and each lender was granted an additional 7,500,000 warrants to purchase shares of the Company’s common stock at $0.06 per share. The warrants were immediately exercisable. In December 2016, the 2013 Promissory Note was further modified to extend the maturity date to December 31, 2022, with all remaining terms unchanged. On December 23, 2018, all 25,000,000 warrants expired. At March 31, 2019, the balance of the 2013 Promissory Note was $500,000 and accrued interest payable on the note was $159,234. Interest expense recorded for the three-month period ended March 31, 2019, was $7,500. In March 2016, the Company entered into a note payable for the purchase of a vehicle. The principal amount financed was $47,513. The term of the note is six years and carries an interest rate of 6.66% per annum. Monthly payments are $805 and the note matures April 2022. The note is secured by the vehicle that was purchased with the note’s proceeds. In August 2017, the Company entered into a promissory note agreement with its Chairman of the Board pursuant to which the Company borrowed $60,000 (the 2017 Promissory Note). The 2017 Promissory Note accrues interest at 5% per annuum, which is payable upon maturity of the 2017 Promissory Note, and at March 31, 2019, the amount of accrued interest on the 2017 Promissory Note was $4,867. The 2017 Promissory Note is unsecured and was scheduled to mature on June 30, 2018. Pursuant to an amendment to the 2017 Promissory Note on June 29, 2018, the maturity date was extended to March 31, 2019 with all other provisions remaining unchanged. Pursuant to a second amendment to the 2017 Promissory Note on February 2019, the maturity date was extended to July 31, 2019 with all other provisions of the 2017 Promissory Note remaining unchanged. On April 30, 2019, the 2017 Promissory Note and accrued interest were repaid in full with a cash payment of $65,367. On April 9, 2018, the Company borrowed $120,000 from its Chief Executive Officer and its Chairman of the Board pursuant to a short-term promissory note (the 2018 Promissory Note). The 2018 Promissory Note accrues interest at 6% per annum, which is payable upon maturity of the 2018 Promissory Note. The 2018 Promissory Note is unsecured and originally matured on August 1, 2018. At any time, the holder of the 2018 Promissory Note may elect to have any or all of the principal and accrued interest settled with shares of the Company’s common stock based on the average price of the shares over the previous 20 trading days. Pursuant to an amendment to the 2018 Promissory Note on June 29, 2018, the maturity date was extended to March 31, 2019 with all other provisions remaining unchanged. Pursuant to a second amendment to the 2018 Promissory Note on February 12, 2019, the maturity date was extended to July 31, 2019, with all other provisions remaining unchanged. At March 31, 2019, accrued interest on the 2018 Promissory Note totaled $7,020. In February 2019, the Company borrowed $185,474 from RadQual pursuant to a short-term promissory note with a stated interest rate of 6% and a maturity date of July 31, 2019. The promissory note is unsecured.

Debt

3 Months Ended

Mar. 31, 2019

(7) Debt

In December 2013, the Company entered into a promissory note agreement with its former Chairman of the Board and one of its major shareholders pursuant to which the Company borrowed $500,000 (the 2013 Promissory Note). The 2013 Promissory Note is unsecured and bears interest at 6% per annum and was originally due on June 30, 2014. According to the terms of the 2013 Promissory Note, at any time, the lenders may settle any or all of the principal and accrued interest with shares of the Company’s common stock. In connection with the 2013 Promissory Note, each of the two lenders was issued 5,000,000 warrants to purchase shares of the Company’s common stock at $0.06 per share. The warrants were immediately exercisable. In June 2014, the Company renegotiated the terms of the 2013 Promissory Note. Pursuant to the modification, the maturity date was extended to December 31, 2017 and each lender was granted an additional 7,500,000 warrants to purchase shares of the Company’s common stock at $0.06 per share. The warrants were immediately exercisable. In December 2016, the 2013 Promissory Note was further modified to extend the maturity date to December 31, 2022, with all remaining terms unchanged. On December 23, 2018, all 25,000,000 warrants expired. At March 31, 2019, the balance of the 2013 Promissory Note was $500,000 and accrued interest payable on the note was $159,234. Interest expense recorded for the three-month period ended March 31, 2019, was $7,500.

In March 2016, the Company entered into a note payable for the purchase of a vehicle. The principal amount financed was $47,513. The term of the note is six years and carries an interest rate of 6.66% per annum. Monthly payments are $805 and the note matures April 2022. The note is secured by the vehicle that was purchased with the note’s proceeds.

In August 2017, the Company entered into a promissory note agreement with its Chairman of the Board pursuant to which the Company borrowed $60,000 (the 2017 Promissory Note). The 2017 Promissory Note accrues interest at 5% per annuum, which is payable upon maturity of the 2017 Promissory Note, and at March 31, 2019, the amount of accrued interest on the 2017 Promissory Note was $4,867. The 2017 Promissory Note is unsecured and was scheduled to mature on June 30, 2018. Pursuant to an amendment to the 2017 Promissory Note on June 29, 2018, the maturity date was extended to March 31, 2019 with all other provisions remaining unchanged. Pursuant to a second amendment to the 2017 Promissory Note on February 2019, the maturity date was extended to July 31, 2019 with all other provisions of the 2017 Promissory Note remaining unchanged. On April 30, 2019, the 2017 Promissory Note and accrued interest were repaid in full with a cash payment of $65,367.

On April 9, 2018, the Company borrowed $120,000 from its Chief Executive Officer and its Chairman of the Board pursuant to a short-term promissory note (the 2018 Promissory Note). The 2018 Promissory Note accrues interest at 6% per annum, which is payable upon maturity of the 2018 Promissory Note. The 2018 Promissory Note is unsecured and originally matured on August 1, 2018. At any time, the holder of the 2018 Promissory Note may elect to have any or all of the principal and accrued interest settled with shares of the Company’s common stock based on the average price of the shares over the previous 20 trading days. Pursuant to an amendment to the 2018 Promissory Note on June 29, 2018, the maturity date was extended to March 31, 2019 with all other provisions remaining unchanged. Pursuant to a second amendment to the 2018 Promissory Note on February 12, 2019, the maturity date was extended to July 31, 2019, with all other provisions remaining unchanged. At March 31, 2019, accrued interest on the 2018 Promissory Note totaled $7,020.

In February 2019, the Company borrowed $185,474 from RadQual pursuant to a short-term promissory note with a stated interest rate of 6% and a maturity date of July 31, 2019. The promissory note is unsecured.