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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Cash flows from operating activities:    
Net loss and comprehensive loss $ (22,515,000) $ (24,691,000)
us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract    
Depreciation 907,000 942,000
Amortization of debt discount and issuance costs 959,000 337,000
Amortization of right-of-use asset 101,000 90,000
Interest expense added to loan principal 1,686,000 711,000
Interest expense added to lease liability 1,770,000 1,570,000
Finance expense 307,000 0
Unrealized loss on derivative liability 0 220,000
Loss on early extinguishment of debt 0 5,331,000
Compensation charge for stock and share option awards 3,566,000 1,142,000
Changes in operating assets and liabilities:    
Accounts receivable (2,339,000) 44,000
Inventories (2,240,000) (1,812,000)
Prepaid expenses and other current assets (582,000) (402,000)
Other assets 104,000 (532,000)
Accounts payable 564,000 1,312,000
Lease liabilities (139,000) (80,000)
Deferred revenue 1,659,000 93,000
Other accrued liabilities 870,000 323,000
Net cash used in operating activities (15,322,000) (15,402,000)
Cash flows from investing activities:    
Additions to property, plant and equipment and water programs (522,000) (3,815,000)
Net cash used in investing activities (522,000) (3,815,000)
Cash flows from financing activities:    
Net proceeds from issuance of stock 0 38,490,000
Dividend payments (3,841,000) (3,841,000)
Proceeds from the issuance of long-term debt 20,000,000 233,000
Principal payments on long-term debt (145,000) (15,119,000)
Issuance costs long-term debt (1,294,000) (27,000)
Costs for early extinguishment of debt 0 (600,000)
Taxes paid related to net share settlement of equity awards (52,000) (261,000)
Net cash provided by financing activities 14,668,000 18,875,000
Net decrease in cash, cash equivalents and restricted cash (1,176,000) (342,000)
Cash, cash equivalents and restricted cash, beginning of period 4,636,000 13,782,000
Cash, cash equivalents and restricted cash, end of period $ 3,460,000 $ 13,440,000