Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating activities:
Net loss	$ (17,684)	$ (21,307)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	4,912	5,751
Non-cash lease expense	(160)	(374)
Non-cash transaction costs including amortization of debt discount and issuance costs	5,398	1,422
Change in fair value of warrant and derivative liabilities	(3,486)	(3,457)
Loss on derecognition of debt	2,985	0
Stock based compensation	3,316	3,849
Loss on disposal of assets	12	31
Changes in operating accounts:
Accounts receivable	208	1,108
Prepaid expenses and other assets	220	186
Accounts payable and accrued liabilities	(2,224)	(1,526)
Other liabilities	553	(161)
Net cash used in operating activities	(5,950)	(14,478)
Investing activities:
Capital expenditures, net	(5)	(85)
Other investing activities	71	94
Net cash provided by investing activities	66	9
Financing activities:
Proceeds from notes and warrants offering	0	15,000
Proceeds from stock and warrants offering	0	3,000
Stock, notes, and warrants offering costs	0	(1,227)
Proceeds from financing arrangements	981	1,541
Repayments of financing arrangements	(1,156)	(978)
Other financing activities	15	56
Net cash (used in) provided by financing activities	(160)	17,392
Net (decrease) increase in cash and cash equivalents	(6,044)	2,923
Cash and cash equivalents, beginning of period	14,026	16,078
Cash and cash equivalents, end of period	7,982	19,001
Non-cash investing and financing activities:
Issuance of common stock in settlement and prepayment of notes payable	12,180	0
Derivative and warrants in connection with notes and stock offerings	$ 0	$ 9,578