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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Cash flows from operating activities:    
Net loss and comprehensive loss $ (17,323) $ (15,722)
Depreciation 605 600
Amortization of debt discount and issuance costs 737 611
Amortization of right-of-use asset 171 66
Interest expense added to loan principal 1,362 1,024
Interest expense added to lease liability 1,307 1,166
Finance expense 0 307
Compensation charge for stock and share option awards 3,319 2,380
Changes in operating assets and liabilities:    
Accounts receivable 496 (715)
Inventories 9 (2,391)
Prepaid expenses and other current assets 155 (498)
Other assets 65 73
Accounts payable 1,137 670
Lease liabilities (214) (154)
Deferred revenue 1,776 1,470
Other accrued liabilities 1,398 1,177
Net cash used in operating activities (5,000) (9,936)
Cash flows from investing activities:    
Additions to property, plant and equipment and water programs (5,800) (467)
Additions to deposits for asset purchase options (5,000) 0
Net cash used in investing activities (10,800) (467)
Cash flows from financing activities:    
Net proceeds from issuance of stock 18,335 0
Dividend payments (2,553) (2,553)
Proceeds from the issuance of long-term debt 0 20,000
Principal payments on long-term debt (72) (98)
Issuance costs long-term debt 0 (1,294)
Payment for contingent consideration liabilities (1,200) 0
Taxes paid related to net share settlement of equity awards (172) (52)
Net cash provided by financing activities 14,338 16,003
Net (decrease) increase in cash, cash equivalents and restricted cash (1,462) 5,600
Cash, cash equivalents and restricted cash, beginning of period 17,426 4,636
Cash, cash equivalents and restricted cash, end of period $ 15,964 $ 10,236