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Supplemental Disclosure of Cash Flow and Non-Cash Investing and Financing Activities
 12 Months Ended
Dec. 31, 2020
Supplemental Cash Flow Elements [Abstract]  
Supplemental Disclosure of Cash Flow and Non-Cash Investing and Financing Activities Supplemental Disclosure of Cash Flow and Non-Cash Investing and Financing Activities
Selected cash payments, receipts, and noncash activities are as follows (in thousands):
Years Ended December 31,
 202020192018
Cash paid for interest$7,456 $4,331 $197 
Income taxes paid208 308 859 
Cash paid for operating leases1,569 1,650 — 
Non-cash activities:
Purchases of equipment included in accounts payable1,062 1,184 1,168 
Deferred financing costs53 6,650 — 
Deemed dividends on convertible preferred stock Series B32,028 — — 
Amendment fee on BT Term Loan722 — — 
Lease right of use asset and liability1,169 — — 
Fair value of non-cash consideration received for option exercise922 — —