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Supplemental Disclosure of Cash Flow and Non-Cash Investing and Financing Activities (Tables) | 9 Months Ended
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Sep. 30, 2021
Supplemental Cash Flow Elements [Abstract] |
Supplemental Disclosure of Cash Flow and Non-cash Investing and Financing Activities | Selected cash payments, receipts, and non-cash activities are as follows (in thousands):
| Nine Months Ended September 30,
| 2021 |  | 2020
Cash paid for interest | $ | 3,269 |  |  | $ | 6,308 |
Income taxes paid | 157 |  |  | 213 |
Non-cash activities: |  |  |
Lease right of use asset and liability | 189 |  |  | — |
Note receivable for sale of property and equipment | 75 |  |  | — |
Purchases of equipment in accounts payable | 6 |  |  | — |
Fair value of non-cash consideration received for option exercise | 380 |  |  | — |
Deemed dividends on Series B Convertible Preferred Stock | 926 |  |  | 31,568 |
Deferred financing costs | — |  |  | 471 |
Stock issuance costs | — |  |  | 942 |
Amendment fee on BT Term Loan | — |  |  | 722 |

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