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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net loss $ (5,971) $ (7,227)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 66 71
Amortization of debt discount and issuance costs 992 742
Interest expense added to loan principal 2,361 2,038
Interest expense added to lease liability 262 226
Loss on debt conversion 1
Compensation charge for stock and share option awards 105 1,816
Unrealized gain on warrant derivative liabilities (516)
Changes in operating assets and liabilities:    
Accounts receivable (2) (45)
Prepaid expenses and other current assets (291) 2,728
Other assets (13) (271)
Accounts payable 528 414
Accrued liabilities (1,459) (3,127)
Net cash used in operating activities (3,937) (2,635)
Cash flows from investing activities:    
Additions to property, plant and equipment and water programs (502) (116)
Net cash used in investing activities (502) (116)
Cash flows from financing activities:    
Principal payments on long-term debt (14) (14)
Net cash used in financing activities (14) (14)
Net decrease in cash, cash equivalents and restricted cash (4,453) (2,765)
Cash, cash equivalents and restricted cash, beginning of period 13,163 12,305
Cash, cash equivalents and restricted cash, end of period $ 8,710 $ 9,540