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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:        
Net income (loss) $ (1,597) $ (4,946) $ (11,086) $ 12,068
Adjustments to reconcile net income (loss) to net cash used in operating activities:        
Depreciation expense 4,585 4,383 8,822 6,992
Loss from equity methods investments       1,098
(Gain) loss on disposal of fixed assets     (319) 1,643
Gain on bargain purchase       (27,067)
Interest capitalized to notes payable to related parties     3,121 2,480
Change in operating assets and liabilities, net of acquisitions:        
Accounts receivable (601) (1,565) (559) (1,299)
Due from/to related parties (708) 1,483 (1,145) 1,054
Inventory 59 (17) (30) 15
Prepaid expenses and other assets 709 (618) (1,588) (121)
Accounts payable 580 988 737 (199)
Accrued liabilities     1,544 (277)
Accrued liabilities and other current liabilities 1,852 125    
Deferred revenue     79 (99)
Customer deposits     (1) 30
Net cash used/received in operating activities 4,879 (167) (425) (3,682)
Cash flows from investing activities:        
Acquisition of fixed assets (1,577) (819) (833) (32)
Proceeds on sales of fixed assets   800 902 2,412
Acquisition of Prometheus Energy, net of cash received       969
Investments in limited liabilities companies, net of cash received       (1,879)
Net cash provided by investing activities (1,577) (19) 69 1,470
Cash flows from financing activities:        
Payments on long-term borrowings     (2,412) (3,580)
Proceeds from long-term borrowings from related parties     4,603 9,337
Payments on long-term borrowings from related parties (1,672) (19) (1,933) (2,657)
Proceeds from short-term notes payable 216 408 425 569
Payments on short-term notes payable (176) (244) (569) (619)
Net cash provided by or used in financing activities (1,632) 145 114 3,050
Net increase (decrease) in cash and cash equivalents 1,670 (41) (242) 838
Cash and cash equivalents, beginning of period 1,247 1,489 1,489 651
Cash and cash equivalents, end of period $ 2,917 $ 1,448 1,247 1,489
Supplemental disclosure of cash flow information:        
Interest paid     1,387 1,417
Income taxes paid     0 $ 0
Non-cash investing and financing activities:        
Restructure of long-term debt     49,243  
Note receivable applied to long-term debt     (500)  
Equipment acquired under capital leases     $ 1,467