Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities
Net loss	$ (50,290)	$ (99,613)	$ (106,589)
Adjustments to reconcile net loss to cash used in operating activities:
Stock-based compensation	8,295	20,303	61,765
Depreciation and amortization	1,375	900	232
Loss from sale of property and equipment	(2)	183	0
Amortization of debt issue costs	709	703	461
Provision for litigation settlement	0	4,493	0
Provision for obsolete and slow-moving inventory	706	1,813	90
(Gain) loss from unconsolidated subsidiary	660	0	354
Gain from disposal of investment in unconsolidated subsidiary	(1,319)	(1,745)	(20,829)
Gain on extinguishment of debt	0	0	(790)
Warranty and remediation provisions	4,310	8,228	8,588
Warranty recoverable from manufacturer	90	(302)	(928)
Credit losses and bad debt expense (credit)	7,373	1,159	(91)
Deferred income taxes	138	(135)	0
Lease expense and other	996	705	458
Impact on cash from changes in operating assets and liabilities:
Accounts receivable	(23,600)	57,337	(83,723)
Inventories	10,338	(7,902)	(7,264)
Prepaid and other current assets	(3,681)	7,189	(10,237)
Other assets	383	(1,019)	(2,137)
Accounts payable	(7,960)	(22,940)	21,659
Accruals and other current liabilities	10,582	(32,670)	34,095
Deferred revenue	(7,704)	9,895	(21,559)
Other non-current liabilities	(3,083)	(599)	(6,016)
Lease payments and other, net	(972)	(493)	(393)
Net cash used in operations	(52,656)	(54,510)	(132,854)
Cash flows from investing activities:
Purchases of property and equipment	(816)	(985)	(1,025)
Proceeds from sale of property and equipment	0	86	0
Equity method investment in Alpha Steel	(900)	0	0
Acquisitions, net of cash acquired	0	(5,093)	0
Proceeds from disposal of investment in unconsolidated subsidiary	1,319	1,745	22,332
Net cash provided by (used in) investing activities	(397)	(4,247)	21,307
Cash flows from financing activities:
Repayments of borrowings	0	0	(1,000)
Repurchase and retirement of common stock held by related parties	0	0	(54,155)
Sale of common stock	34,007	0	0
Stock Offering costs paid	(283)	0	(5,948)
Proceeds from stock issuance	0	0	241,155
Proceeds from stock option exercises	226	903	317
Net cash provided by financing activities	33,950	903	180,369
Effect of exchange rate changes on cash and cash equivalents	(47)	54	(10)
Increase (decrease) in cash and cash equivalents	(19,150)	(57,800)	68,812
Cash and cash equivalents at beginning of period	44,385	102,185	33,373
Cash and cash equivalents at end of period	25,235	44,385	102,185
Supplemental disclosures of cash flow information:
Purchases of property and equipment included in ending accounts payable and accruals	166	11	478
Stock issued for accrued legal settlement	2,000	0	0
Right-of-use asset and lease liability recognition for new leases	1,417	0	1,540
Cash paid during the period for third party interest	576	784	254
Cash paid during the period for related party interest	0	0	207
Cash paid during the period for taxes, net of refunds	$ 177	$ 123	$ 76