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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net loss $ (24,395,000) $ (22,515,000)
Depreciation 909,000 907,000
Amortization of debt discount and issuance costs 1,128,000 959,000
Amortization of right-of-use asset 261,000 101,000
Interest expense added to loan principal 2,072,000 1,686,000
Interest expense added to lease liability 1,988,000 1,770,000
Finance expense 0 307,000
Compensation charge for stock and share option awards 3,822,000 3,566,000
Changes in operating assets and liabilities:    
Accounts receivable 939,000 (2,339,000)
Inventories 225,000 (2,240,000)
Prepaid expenses and other current assets 43,000 (582,000)
Other assets 96,000 104,000
Accounts payable 427,000 564,000
Lease liabilities (256,000) (139,000)
Deferred revenue (802,000) 1,659,000
Other accrued liabilities 1,533,000 870,000
Net cash used in operating activities (12,010,000) (15,322,000)
Cash flows from investing activities:    
Additions to property, plant and equipment and water programs (6,250,000) (522,000)
Additions to deposits for asset purchase options (5,000,000) 0
Net cash used in investing activities (11,250,000) (522,000)
Cash flows from financing activities:    
Net proceeds from issuance of stock 18,335,000 0
Dividend payments (3,841,000) (3,841,000)
Proceeds from the issuance of long-term debt 0 20,000,000
Principal payments on long-term debt (99,000) (145,000)
Issuance costs long-term debt 0 (1,294,000)
Payment for contingent consideration liabilities (1,200,000) 0
Taxes paid related to net share settlement of equity awards (172,000) (52,000)
Net cash provided by financing activities 13,023,000 14,668,000
Net decrease in cash, cash equivalents and restricted cash (10,237,000) (1,176,000)
Cash, cash equivalents and restricted cash, beginning of period 17,426,000 4,636,000
Cash, cash equivalents and restricted cash, end of period $ 7,189,000 $ 3,460,000