Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net loss	$ (15,137)	$ (29,516)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	60	509
Stock-based compensation	972	2,295
Non-cash lease expense	309	417
Loss on impairment of goodwill	3,058	12,090
Loss on sale and disposal of property and equipment	12	19
Unrealized gain on foreign exchange rate changes	(261)	(941)
Changes in assets and liabilities:
Prepaid expenses and other current assets	443	687
Accounts payable	695	(283)
Accrued expenses	317	(898)
Operating lease liabilities	(338)	(451)
Net cash used in operating activities	(9,870)	(16,072)
Cash flows from investing activities:
Proceeds from sale of property and equipment	0	210
Purchase of property and equipment	(15)	(13)
Net cash (used in) provided by investing activities	(15)	197
Cash flows from financing activities:
Proceeds from issuance of common stock and warrants, net of issuance costs	10,794	0
Proceeds from exercise of common stock warrants, net of expenses	843	0
Principal payments on loans payable	(563)	(797)
Proceeds from ATM Program, net of issuance costs	0	2,760
Net cash provided by financing activities	11,074	1,963
Net increase (decrease) in cash, cash equivalents, and restricted cash	1,189	(13,912)
Cash, cash equivalents, and restricted cash - beginning of period	6,326	22,502
Cash, cash equivalents, and restricted cash - end of period	7,515	8,590
Supplementary disclosure of non-cash activity:
Prepayment of insurance through third-party financing	778	1,132
January 2023 Existing Warrants [Member]
Supplementary disclosure of non-cash activity:
Fair value of warrant modifications related to the warrant exercise inducement	1,238	0
February 2023 Existing Warrants [Member]
Supplementary disclosure of non-cash activity:
Fair value of warrant modifications related to the warrant exercise inducement	$ 274	$ 0