Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net loss	$ (20,514,000)	$ (7,260,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	79,000	66,000
Amortization of debt discount and issuance costs	351,000	1,009,000
Interest expense added to loan principal	1,854,000	2,489,000
Interest expense added to lease liability	347,000	300,000
Loss on equity method investments	626,000
Loss on debt conversion and extinguishment of debt	12,396,000
Debt conversion expense		197,000
Compensation charge for stock and share option awards	1,250,000	122,000
Unrealized loss on warrant derivative liabilities	561,000
Changes in operating assets and liabilities:
Accounts receivable	(27,000)	(21,000)
Prepaid expenses and other current assets	(246,000)	(244,000)
Other assets	(271,000)	(284,000)
Accounts payable	738,000	663,000
Accrued liabilities	(1,523,000)	(1,072,000)
Net cash used in operating activities	(4,379,000)	(4,035,000)
Cash flows from investing activities:
Contributions to equity-method investments	(1,240,000)
Additions to property, plant and equipment and water programs	(3,453,000)	(165,000)
Net cash used in investing activities	(4,693,000)	(165,000)
Cash flows from financing activities:
Net proceeds from issuance of stock	3,923,000	7,891,000
Principal payments on long-term debt	(15,000)	(14,000)
Net cash provided by (used in) financing activities	3,908,000	7,877,000
Net (decrease) increase in cash, cash equivalents and restricted cash	(5,164,000)	3,677,000
Cash, cash equivalents and restricted cash, beginning of period	15,816,000	12,691,000
Cash, cash equivalents and restricted cash, end of period	$ 10,652,000	$ 16,368,000