Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities
Net loss	$ (8,771)	$ (11,762)
Adjustments to reconcile net loss to cash used in operating activities:
Stock-based compensation	1,639	4,890
Depreciation and amortization	404	334
Amortization of debt issue cost	177	177
Provision (credit) for obsolete and slow-moving inventory	177	1,261
Loss from unconsolidated subsidiary	265	0
Gain from disposal of investment in unconsolidated subsidiary	(4,085)	(898)
Warranty and remediation provisions	838	1,543
Warranty recoverable from manufacturer	98	(54)
Credit loss provisions	670	0
Deferred income taxes	225	216
Lease expense and other	309	229
Impact on cash from changes in operating assets and liabilities:
Accounts receivable	(1,770)	(11,412)
Inventories	(116)	5,078
Prepaid and other current assets	45	817
Other assets	(226)	(882)
Accounts payable	3,989	7,882
Accruals and other current liabilities	(6,200)	(616)
Deferred revenue	1,285	(2,677)
Other non-current liabilities	(523)	(2,212)
Lease payments and other, net	(287)	(230)
Net cash used in operating activities	(11,857)	(8,316)
Cash flows from investing activities:
Purchases of property and equipment	(432)	(28)
Equity method investment in Alpha Steel	(1,035)	(900)
Proceeds from disposal of investment in unconsolidated subsidiary	4,085	898
Net cash provided by (used in) investing activities	2,618	(30)
Cash flows from financing activities:
Sale of common stock	0	5,450
Stock offering costs paid	0	(32)
Proceeds from stock option exercises	0	51
Net cash provided by financing activities	0	5,469
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(59)	(15)
Decrease in cash, cash equivalents and restricted cash	(9,298)	(2,892)
Cash and cash equivalents at beginning of period	25,235	44,385
Cash and cash equivalents at end of period	15,937	41,493
Supplemental disclosures of cash flow information:
Purchases of property and equipment included in ending accounts payable and accruals	175	32
Stock issued for accrued legal settlement	0	2,000
Right-of-use asset and lease liability recognition for new leases	0	1,417
Cash paid during the period for interest	140	129
Cash paid during the period for taxes, net of refunds	$ 58	$ 6