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Long-Term Debt​, Net of Debt Discount and Financing Fees | 12 Months Ended
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Dec. 31, 2022
Debt Disclosure [Abstract] |
Long-Term Debt​, Net of Debt Discount and Financing Fees | Long-Term Debt, Net of Debt Discount and Financing Fees Long-term debt, net of debt discount and financing fees consists of the following:
(in thousands) | December 31, 2022 |  | December 31, 2021 |  |
Credit Facility - first tranche | $ | 35,000 |  |  | $ | 35,000 |  |  |
Credit Facility - second tranche | 15,000 |  |  | 15,000 |  |  |
Less - unamortized debt discount and deferred financing fees | (4,288) |  |  | (5,179) |  |  |
Long-term debt, net of debt discount and financing fees | $ | 45,712 |  |  | $ | 44,821 |  |  |
Credit Facility On June 30, 2020, the Company entered into a seven-year financing agreement (the “Credit Facility”) with Oberland Capital and its affiliates TPC Investments II LP and Argo SA LLC (collectively, the "Lender") and obtained the first tranche of $35,000 at closing. On June 30, 2021, the second tranche of $15,000 was drawn down by the Company. The financing costs for this facility were $642 and were recorded as a contra liability to the long-term debt on the consolidated balance sheet. The financing costs were paid as of December 31, 2021. Each tranche under the Credit Facility requires quarterly interest payments for seven years. Interest is calculated as 7.5% plus the greater of the London Interbank Offered Rate ("LIBOR") or 2.0% (11.24% as of December 31, 2022). Each tranche of the Credit Facility has a term of seven years from the date of issuance (with the first tranche issued on June 30, 2020, maturing on June 30, 2027, and the second tranche issued on June 30, 2021, maturing on June 30, 2028). In connection with the Credit Facility, the Company entered into a revenue participation agreement (the “Revenue Participation Agreement”) with the Lender, which provided that, among other things, a quarterly royalty payment as a percentage of the Company’s net revenues up to $70 million in any given year, after April 1, 2021, ending on the date upon which all amounts owed under the Credit Facility have been paid in full. This structure results in approximately 1.0% per year of additional interest payments on the outstanding loan amount. The Company recorded $756 and $646 as interest expense for this Revenue Participation Agreement for the years ended December 31, 2022, and 2021, respectively. The Company pays the quarterly debt interest on the last day of the quarter, and for the years ended December 31, 2022, and 2021, paid $5,074 and $4,103, respectively, to the Lender. The Company capitalized interest of $6,155 and $4,277 for the years ended December 31, 2022, and 2021, respectively, towards the costs to construct and retrofit its APC Facility in Vandalia, OH. See Note 14 - Commitments and Contingencies. To date, the Company has capitalized interest of $11,429 related to this project. The capitalized interest is recorded as part of property and equipment in the consolidated balance sheets. Additionally, the Lender had the right to purchase up to $3,500 worth of the Company's common stock from the Company in one transaction at any time after closing of the Credit Facility until the later of (i) the date all amounts due under the Credit Facility are repaid and (ii) June 30, 2027 (the “Credit Facility Option”). The purchase price of the common stock was calculated based on the 45-day moving average of the closing stock price on the day prior to the purchase. On December 10, 2020, the Lender exercised in full its option under the Credit Facility Option. The exercise price was determined to be $14.13, resulting in gross proceeds to the Company of $3,500 and the issuance of 247,699 shares to a wholly owned subsidiary of the Lender. In conjunction with the issuance of the shares, the Lender received certain protective rights (including protection from down-round stock issuances) for a period of one year subsequent to the issuance. These rights expired on December 10, 2021. The amounts outstanding under the Credit Facility may be accelerated upon certain events, including: (a) required mandatory prepayments upon an asset sale; (b) in the event the Company is subject to (i) any litigation brought by a Governmental Authority (as defined in the Credit Facility) including intervention after litigation is commenced by a Person (as defined in the Credit Facility), or (ii) any final administrative action by a Governmental Authority, in each case arising out of or in connection with any of the Company’s registry studies, payments made to doctors or training activities with respect to healthcare professionals (excluding certain final administrative actions that have been fully and finally resolved by the parties pursuant to a settlement agreement) or (c) upon the occurrence of an event of default (either automatically or at the option of the Lender depending on the nature of the event). In addition, the Company has the right to prepay any amounts outstanding under the Credit Facility. Upon maturity or upon such earlier repayment of the Credit Facility, the Company will repay the principal balance and provide a make-whole payment calculated to generate an internal rate of return to the Lender equal to 11.5%, less the total of all quarterly interest and royalty payments previously paid to the Lender. See Note 14 - Commitments and Contingencies for further information related to the make-whole payment calculation. Upon the occurrence of an event of default, the interest rate incurred on amounts outstanding under the Credit Facility will be increased by 4%. The Credit Facility includes a financial covenant requiring the Company to achieve certain revenue targets each quarter. As of December 31, 2022, the Company was in compliance with all the covenants. In the event of a failure to meet such covenant the Company may avoid a default by electing to be subject to a liquidity covenant and meeting all of the obligations required by such covenant. The borrowings under the Credit Facility are secured by substantially all of the assets of the Company. The Company determined that Credit Facility included separable embedded features on a combined basis as a single derivative feature. The Company estimated the fair value of these features as $2,387 as of the date of issuance of the Credit Facility and recorded this value as a debt derivative liability. As a result of the second tranche draw on June 30, 2021, the Company recorded an additional derivative and estimated the fair value to be $1,961, along with an increase of $1,076 related to the first tranche derivative. See Note 6 - Fair Value Measurement. The debt derivative liabilities are recorded at fair value, with the change in fair value reported in change in the fair value of the derivative on the consolidated statements of operations at each reporting date. See Note 6 - Fair Value Measurement. Unamortized Debt Discount and Financing Fees The unamortized debt discount consists of the remaining initial fair values of the embedded derivatives related to the Credit Facility. The financing fees for the Credit Facility were $642 and were recorded as a contra liability to long-term debt on the consolidated balance sheet. Amortization of debt discount and deferred financing fees for the years ended December 31, 2022, 2021 and 2020, was $891, $831 and $232, respectively, and recorded in interest expense using the effective interest rate method. Other Credit Facilities The Company had restricted cash of $6,251 and $6,251 at December 31, 2022, and 2021, respectively. The December 31, 2022, and 2021 balances both include $6,000, which represents collateral for an irrevocable standby letter of credit. In March 2021, the Company entered into an agreement which required an additional irrevocable standby letter of credit in the amount of $250.

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