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Debt | 9 Months Ended
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Sep. 30, 2021
Debt [Abstract] |
Debt |
5. | Debt
Horizon loan agreement In September 2019, the Company entered into a loan and security agreement (“Horizon loan agreement”) with Horizon Technology Finance Corporation (“Horizon”) under which it could borrow up to a total of $20.0 million at a floating per annum rate equal to 10% plus the amount by which the 30-day U.S. dollar LIBOR rate on the first business day of the month exceeds 2.2%. The Horizon loan agreement initially required interest only payments through October 2021 and then 36 monthly principal and interest payments beginning in November 2021. A final payment of $0.7 million, equal to 3.5% of the original principal, is due in October 2024. The Horizon loan agreement initially required the Company to maintain cash on deposit of not less than $5.0 million in accounts over which Horizon maintained an account control agreement. This minimum cash on deposit requirement was released in July 2020, following the satisfaction of a financing milestone. The borrowings are collateralized by all or substantially all of the assets of the Company. The Horizon loan agreement requires the payment of certain penalties if the loan is paid off prior to maturity for any reason, including pursuant to a subjective acceleration clause, and includes various restrictive covenants, including a restriction on the payment of dividends. The Company was in compliance with these covenants as of September 30, 2021. In August 2020, the Company entered into an amended agreement with Horizon to extend the interest only period through April 2022, followed by 30 monthly principal and interest payments beginning in May 2022. In connection with the Horizon loan agreement, the Company recorded $1.1 million of debt issuance costs and discounts as a reduction of long-term debt. Of this total, $0.5 million related to legal fees and an investment bank fee and $0.6 million related to the warrants to purchase Series G Preferred Shares issued by the Company. These warrants were exercisable on the grant date at a price of $0.80 per share and expire in September 2029. The Company used the Black-Scholes option pricing model to determine the grant date fair value of these warrants. The annual principal maturities of debt as of September 30, 2021 are as follows (in thousands):
​ | ​ | ​ | ​
2021 |  | $ | —
2022 | ​ |  | 5,333
2023 | ​ |  | 8,000
2024 | ​ |  | 6,667
​ | ​ |  | 20,000
Less: Unamortized debt costs and discounts | ​ |  | (516)
Less: current portion | ​ | ​ | (3,333)
Long-term debt | ​ | $ | 16,151
​

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(c)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1E -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495348-112611 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 + Details
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