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Supplemental Disclosure of Cash Flow and Non-Cash Investing and Financing Activities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Supplemental Cash Flow Elements [Abstract]    
Cash paid for interest $ 3,269 $ 6,308
Income taxes paid 157 213
Non-cash activities:    
Lease right of use asset and liability 189 0
Note receivable for sale of property and equipment 75 0
Purchases of equipment in accounts payable 6 0
Fair value of non-cash consideration received for option exercise 380 0
Deemed dividends on Series B Convertible Preferred Stock 926 31,568
Deferred financing costs 0 471
Stock issuance costs 0 942
Amendment fee on BT Term Loan $ 0 $ 722