Debt	12 Months Ended
Dec. 31, 2019
Debt
Debt	(10) Debt Asset Purchase Consideration Payable The Company granted Apollo a first security interest in substantially all of the Company’s assets as security for the payment and performance when due of all of all of its obligations under the Asset Purchase Agreement, including the remaining asset purchase consideration. On October 28, 2019, the Company received the acknowledgement from Apollo of the termination of the security interest granted by the Company. The security interest was automatically terminated as a result of the Company completing a Qualified Financing, as defined in the Security Agreement, in connection with the Company’s previously disclosed Securities Purchase Agreement, dated June 13, 2019, and Warrant Exercise Agreement, dated September 23, 2019. The net present value of the secured asset purchase consideration payable was determined using a discount rate of 5.1%. At December 31, 2019 and 2018, the aggregate carrying value of the current and noncurrent asset purchase consideration payable of approximately $4.6 million and $6.3 million respectively, as adjusted for accretion of interest of approximately $0.3 million and an immaterial amount, respectively. Convertible Subordinated Debentures On March 29, 2019, the Company completed a private placement with certain healthcare focused institutional investors for the sale of secured subordinated original issue discount convertible debentures (“debentures”) for a purchase price of $2.0 million. The debentures had a maturity of June 28, 2019 and a face amount of $2.2 million, reflecting a 10% original issue discount. The Company recorded an additional debt discount and a derivative liability for the fair value of the bifurcated embedded conversion features discussed below. The initial carrying amount of the debentures, net of discounts and deferred financing costs, was $1.5 million. The Company repaid the debentures on June 20, 2019 at their face amount of $2.2 million with proceeds from an equity financing which closed on June 18, 2019. In connection with the early repayment of the debentures, the Company recorded a loss on extinguishment of debt of $0.1 million, which consisted of the unamortized debt discount and deferred financing costs. The debentures contained a conversion feature that provided that, at any time after June 28, 2019, if the debentures had not been repaid, but subject to certain investor ownership limitations, the debentures were convertible into shares of common stock at a conversion price equal to the lesser of $0.33 and 80% of the average of the lowest two volume weighted average prices of the Company’s common stock during the 20 trading days prior to conversion. The Company analyzed the conversion features embedded in the debentures and determined that bifurcation and liability classification was required under ASC 815 due to the variable number of shares issuable upon conversion. The fair value of the bifurcated embedded conversion features was determined to be $0.5 million as of the issuance date using a Monte Carlo model and primarily Level 3 inputs. Upon the closing of the Company’s equity financing and the Company’s planned use of a portion of the proceeds to repay the debentures, the fair value of the embedded derivative liability was reduced to zero as the conversion feature was no longer available. The fair value adjustment to the embedded derivative liability of $0.5 million was recorded as a reduction to Interest Expense. In connection with the financing, the Company amended the exercise price of warrants to purchase up to 66,667 shares of common stock held by the investors that were issued on November 28, 2018 from $180.00 per share to $1.20 per share. The value attributable to the exercise price reduction of $0.1 million was recorded in Warrant Expense and was estimated using the Black Scholes option pricing model using a risk-free interest rate of 2.2%, an expected term of 4.7 years, expected dividends of zero and expected volatility of 204.4%.

(10) Debt

Asset Purchase Consideration Payable

The Company granted Apollo a first security interest in substantially all of the Company’s assets as security for the payment and performance when due of all of all of its obligations under the Asset Purchase Agreement, including the remaining asset purchase consideration. On October 28, 2019, the Company received the acknowledgement from Apollo of the termination of the security interest granted by the Company. The security interest was automatically terminated as a result of the Company completing a Qualified Financing, as defined in the Security Agreement, in connection with the Company’s previously disclosed Securities Purchase Agreement, dated June 13, 2019, and Warrant Exercise Agreement, dated September 23, 2019. The net present value of the secured asset purchase consideration payable was determined using a discount rate of 5.1%. At December 31, 2019 and 2018, the aggregate carrying value of the current and noncurrent asset purchase consideration payable of approximately $4.6 million and $6.3 million respectively, as adjusted for accretion of interest of approximately $0.3 million and an immaterial amount, respectively.

Convertible Subordinated Debentures

On March 29, 2019, the Company completed a private placement with certain healthcare focused institutional investors for the sale of secured subordinated original issue discount convertible debentures (“debentures”) for a purchase price of $2.0 million. The debentures had a maturity of June 28, 2019 and a face amount of $2.2 million, reflecting a 10% original issue discount. The Company recorded an additional debt discount and a derivative liability for the fair value of the bifurcated embedded conversion features discussed below. The initial carrying amount of the debentures, net of discounts and deferred financing costs, was $1.5 million. The Company repaid the debentures on June 20, 2019 at their face amount of $2.2 million with proceeds from an equity financing which closed on June 18, 2019. In connection with the early repayment of the debentures, the Company recorded a loss on extinguishment of debt of $0.1 million, which consisted of the unamortized debt discount and deferred financing costs.

The debentures contained a conversion feature that provided that, at any time after June 28, 2019, if the debentures had not been repaid, but subject to certain investor ownership limitations, the debentures were convertible into shares of common stock at a conversion price equal to the lesser of $0.33 and 80% of the average of the lowest two volume weighted average prices of the Company’s common stock during the 20 trading days prior to conversion. The Company analyzed the conversion features embedded in the debentures and determined that bifurcation and liability classification was required under ASC 815 due to the variable number of shares issuable upon conversion. The fair value of the bifurcated embedded conversion features was determined to be $0.5 million as of the issuance date using a Monte Carlo model and primarily Level 3 inputs. Upon the closing of the Company’s equity financing and the Company’s planned use of a portion of the proceeds to repay the debentures, the fair value of the embedded derivative liability was reduced to zero as the conversion feature was no longer available. The fair value adjustment to the embedded derivative liability of $0.5 million was recorded as a reduction to Interest Expense.

In connection with the financing, the Company amended the exercise price of warrants to purchase up to 66,667 shares of common stock held by the investors that were issued on November 28, 2018 from $180.00 per share to $1.20 per share. The value attributable to the exercise price reduction of $0.1 million was recorded in Warrant Expense and was estimated using the Black Scholes option pricing model using a risk-free interest rate of 2.2%, an expected term of 4.7 years, expected dividends of zero and expected volatility of 204.4%.