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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities:    
Net loss $ (29,800) $ (22,180)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 281 200
Amortization of debt discount and issuance costs 823 3,062
Interest expense added to loan principal 4,120 7,523
Interest expense added to lease liability 1,082 947
Loss on equity method investments 776 0
Loss on debt conversion and extinguishment of debt 12,394 38
Debt conversion expense (0) 197
Compensation charge for stock and share option awards 1,824 410
Unrealized loss on warrant derivative liabilities (259) 0
Changes in operating assets and liabilities:    
Accounts receivable (47) (55)
Prepaid expenses and other current assets (249) (115)
Other assets (214) (215)
Accounts payable 226 405
Accrued liabilities (1,253) (921)
Net cash used in operating activities (10,296) (10,704)
Cash flows from investing activities:    
Contributions to equity-method investments (2,709) 0
Additions to property, plant and equipment and water programs (5,103) (1,428)
Net cash used in investing activities (7,812) (1,428)
Cash flows from financing activities:    
Net proceeds from issuance of stock 9,808 14,890
Proceeds from the issuance of long-term debt 150 0
Principal payments on long-term debt (30) (44)
Net cash provided by financing activities 9,928 14,846
Net (decrease) increase in cash, cash equivalents and restricted cash (8,180) 2,714
Cash, cash equivalents and restricted cash, beginning of period 15,816 12,691
Cash, cash equivalents and restricted cash, end of period $ 7,636 $ 15,405