Unsecured Promissory Notes and Warrants	9 Months Ended
Sep. 30, 2019
Debt Disclosure [Abstract]
Unsecured Promissory Notes and Warrants	Note 11 - Unsecured Promissory Notes and Warrants In June 2016, the Company entered into a Note and Warrant Agreement (the “Note and Warrant Agreement”) with new creditors as well as existing stockholders under which the Company issued unsecured promissory notes and warrants resulting in total gross proceeds to the Company of approximately $1,187,000. The outstanding principal under the notes accrued interest at a rate of 11% per annum. The notes required the Company to make interest only payments on a semi-annual basis, with all outstanding principal under the notes being repayable in cash on the third anniversary of the date of issuance. In addition to the notes, the Company issued warrants to purchase approximately 300,000 shares of the Company’s common stock. The portion of the gross proceeds allocated to the warrants, approximately $393,000, was accounted for as additional paid-in capital resulting in a debt discount. The debt discount, which included approximately $9,000 of debt issuance costs in addition to the fair value of the warrants, was being amortized to interest expense using the effective interest method in accordance with ASC 835 over the term of the Note and Warrant Agreement. On March 30, 2018, the principal balance of the notes, along with the remaining accrued interest of approximately $43,000, was repaid in full. The remaining debt discount of approximately $199,000 was recorded as loss on extinguishment of debt in the Company’s condensed consolidated statements of operations and comprehensive loss for the nine months ended September 30, 2018. For the nine months ended September 30, 2018, approximately $34,000 was recognized as amortization of debt discount and is included in interest expense on the consolidated statement of operations and comprehensive loss. For the nine months ended September 30, 2018, approximately $30,000 of interest expense was incurred. For the nine months ended September 30, 2018, the amount of interest expense recognized related to related parties comprised of entities controlled by a member of management and by Lambda Investors, LLC, the Company’s largest stockholder, was approximately $1,000.

Unsecured Promissory Notes and Warrants

9 Months Ended

Sep. 30, 2019

Note 11 - Unsecured Promissory Notes and Warrants

In June 2016, the Company entered into a Note and Warrant Agreement (the “Note and Warrant Agreement”) with new creditors as well as existing stockholders under which the Company issued unsecured promissory notes and warrants resulting in total gross proceeds to the Company of approximately $1,187,000. The outstanding principal under the notes accrued interest at a rate of 11% per annum. The notes required the Company to make interest only payments on a semi-annual basis, with all outstanding principal under the notes being repayable in cash on the third anniversary of the date of issuance. In addition to the notes, the Company issued warrants to purchase approximately 300,000 shares of the Company’s common stock. The portion of the gross proceeds allocated to the warrants, approximately $393,000, was accounted for as additional paid-in capital resulting in a debt discount. The debt discount, which included approximately $9,000 of debt issuance costs in addition to the fair value of the warrants, was being amortized to interest expense using the effective interest method in accordance with ASC 835 over the term of the Note and Warrant Agreement.

On March 30, 2018, the principal balance of the notes, along with the remaining accrued interest of approximately $43,000, was repaid in full. The remaining debt discount of approximately $199,000 was recorded as loss on extinguishment of debt in the Company’s condensed consolidated statements of operations and comprehensive loss for the nine months ended September 30, 2018.

For the nine months ended September 30, 2018, approximately $34,000 was recognized as amortization of debt discount and is included in interest expense on the consolidated statement of operations and comprehensive loss. For the nine months ended September 30, 2018, approximately $30,000 of interest expense was incurred.

For the nine months ended September 30, 2018, the amount of interest expense recognized related to related parties comprised of entities controlled by a member of management and by Lambda Investors, LLC, the Company’s largest stockholder, was approximately $1,000.