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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities    
Net income (loss) $ 110 $ (10,682)
Adjustments to reconcile net income (loss) to net cash used in operating activities    
Depreciation and amortization 206 868
Net (gain) loss on disposal of assets (1,614) 1,181
Asset impairment charge 675
Stock-based compensation 297 623
Changes in operating assets and liabilities:    
Accounts receivable 211 2,004
Inventories 242 3,286
Other inventory supplies 72 256
Prepaid expenses and other assets (560) 692
Accounts payable (413) (437)
Accrued payroll (66) 109
Corporate income and franchise taxes (21) (101)
Accrued real estate taxes (100) 28
Advanced payments (24) (12)
Accrued and other current liabilities (15) (75)
Net cash used in operating activities (1,675) (1,585)
Cash flows from investing activities    
Proceeds from disposal of assets 3,195 1,849
Purchases of investments (7,139) (9)
Proceeds from sale of investments 102 21
Net cash (used in) provided by investing activities (3,842) 1,861
Cash flows from financing activities    
Taxes paid related to net share settlement of equity awards (5) (173)
Net cash used in financing activities (5) (173)
Net effect of currency translation (1) 4
Net increase (decrease) in cash and cash equivalents (5,523) 107
Cash and cash equivalents, beginning of period 11,725 17,835
Cash and cash equivalents, end of period $ 6,202 $ 17,942