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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net loss $ (12,003) $ (20,797)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 130 143
Amortization of debt discount and issuance costs 1,986 1,835
Interest expense added to loan principal 4,771 4,534
Interest expense added to lease liability 543 471
Gain on debt conversion 57 55
Loss on early extinguishment of debt 3,501
Compensation charge for stock and share option awards 227 1,921
Unrealized gain on warrant derivative liabilities (859)
Changes in operating assets and liabilities:    
Accounts receivable (70) (11)
Prepaid expenses and other current assets (193) 2,875
Other assets 16 (243)
Accounts payable 114 40
Accrued liabilities (1,138) 1,464
Other long-term liabilities (655)
Net cash used in operating activities (6,419) (4,867)
Cash flows from investing activities:    
Additions to property, plant and equipment and water programs (927) (161)
Net cash used in investing activities (927) (161)
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 (28) (44,900)
Net cash provided by financing activities 14,553 12,290
Net increase in cash, cash equivalents and restricted cash 7,207 7,262
Cash, cash equivalents and restricted cash, beginning of period 13,163 12,305
Cash, cash equivalents and restricted cash, end of period $ 20,370 $ 19,567