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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net loss $ (18,243) $ (26,789)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 194 212
Amortization of debt discount and issuance costs 3,002 2,829
Interest expense added to loan principal 7,246 6,884
Interest expense added to lease liability 827 718
Loss on debt conversion 83 56
Loss on early extinguishment of debt 3,501
Compensation charge for stock and share option awards 350 2,027
Unrealized (gain) loss on warrant derivative liabilities (1,268) 3,747
Changes in operating assets and liabilities:    
Accounts receivable (70) (17)
Prepaid expenses and other current assets (124) 2,866
Other assets 45 (214)
Accounts payable 502 (53)
Accrued liabilities (1,188) (3,493)
Net cash used in operating activities (8,644) (7,726)
Cash flows from investing activities:    
Additions to property, plant and equipment and water programs (1,258) (671)
Net cash used in investing activities (1,258) (671)
Cash flows from financing activities:    
Net proceeds from the issuance of stock 14,581
Net proceeds from the issuance of long-term debt 57,190
Principal payments on long-term debt (42) (44,910)
Net cash provided by financing activities 14,539 12,280
Net increase in cash, cash equivalents and restricted cash 4,637 3,883
Cash, cash equivalents and restricted cash, beginning of period 13,163 12,305
Cash, cash equivalents and restricted cash, end of period $ 17,800 $ 16,188