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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS        
Operating Revenues $ 1,914 $ 8,738 $ 13,855 $ 77,216
Operating costs:        
Operating expenses 3,975 9,441 18,247 58,189
General and administrative 2,443 3,270 7,996 11,205
Depreciation and amortization 3,249 4,125 10,083 13,412
Total cost and expenses 9,667 16,836 36,326 82,806
Loss from operations (7,753) (8,098) (22,471) (5,590)
Other income (expense):        
Interest income 50 106 176 326
Interest expense (4) (10) (16) (80)
Other (expense) income, net (158) 177 201 12
Loss before income tax (7,865) (7,825) (22,110) (5,332)
Income tax expense   (15)   (15)
Net loss (7,865) (7,840) (22,110) (5,347)
Other comprehensive (loss) income:        
Net unrealized (loss) income on foreign exchange rate translation, net (307) 374 105 (221)
Comprehensive loss $ (8,172) $ (7,466) $ (22,005) $ (5,568)
Basic loss per share of common stock $ (0.33) $ (0.33) $ (0.94) $ (0.23)
Diluted loss per share of common stock $ (0.33) $ (0.33) $ (0.94) $ (0.23)
Weighted average equivalent common shares outstanding 23,632,112 23,423,437 23,545,693 23,350,204
Weighted average equivalent common shares outstanding - assuming dilution 23,632,112 23,423,437 23,545,693 23,350,204