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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net loss $ (17,506) $ (25,307)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation, Total 206 175
Amortization of debt discount and issuance costs 2,372 587
Amortization of right-of-use asset 15 0
Interest expense added to loan principal 4,209 3,331
Interest expense added to lease liability 806 712
Loss on equity method investments 569 699
Loss on debt conversion and extinguishment of debt 0 12,394
Compensation charge for stock and share option awards 3,440 1,551
Unrealized (gain) loss on warrant derivative liabilities (573) 51
Changes in operating assets and liabilities:    
Accounts receivable (11) (89)
Prepaid expenses and other current assets (544) (243)
Other assets 177 (243)
Accounts payable (154) 879
Lease liabilities (175) 0
Other accrued liabilities 1,170 (1,516)
Net cash used in operating activities (5,999) (7,019)
Cash flows from investing activities:    
Additions to property, plant and equipment and water programs (20,177) (4,712)
Contributions to equity-method investments (259) (2,283)
Net cash used in investing activities (20,436) (6,995)
Cash flows from financing activities:    
Net proceeds from issuance of stock 30,354 3,923
Proceeds from the issuance of warrants 4 0
Principal payments on long-term debt (27) (23)
Net cash provided by financing activities 30,331 3,900
Net increase (decrease) in cash, cash equivalents and restricted cash 3,896 (10,114)
Cash, cash equivalents and restricted cash, beginning of period 7,424 15,816
Cash, cash equivalents and restricted cash, end of period $ 11,320 $ 5,702