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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS    
Operating revenues $ 24,695 $ 86,100
Operating costs:    
Operating expenses 29,016 68,998
General and administrative 12,046 13,920
Depreciation and amortization 12,863 17,174
Total cost and expenses 53,925 100,092
Loss from operations (29,230) (13,992)
Other income (expense):    
Interest income 220 402
Interest expense (21) (83)
Other (expense) income, net (86) 501
Loss before income tax (29,117) (13,172)
Income tax benefit (expense)    
Current 27 (14)
Deferred (1) (10)
Income tax benefit (expense) 26 (24)
Net loss (29,091) (13,196)
Other comprehensive income:    
Net unrealized income on foreign exchange rate translation, net 190 372
Comprehensive loss $ (28,901) $ (12,824)
Basic loss per share of common stock $ (1.23) $ (0.56)
Diluted loss per share of common stock $ (1.23) $ (0.56)
Weighted average equivalent common shares outstanding 23,570,455 23,382,433
Weighted average equivalent common shares outstanding - assuming dilution 23,570,455 23,382,433