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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement [Abstract] |  |  |
Revenue | $ 250,959 | $ 303,308 | $ 221,247
Cost of revenue | 268,710 | 320,307 | 228,443
Gross loss | (17,751) | (16,999) | (7,196)
General and administrative expense | 13,858 | 15,628 | 19,015
Impairments and (gain) loss on assets held for sale | 4,130 | 17,528 | (6,850)
Other (income) expense, net | (8,580) | (134) | 304
Operating loss | (27,159) | (50,021) | (19,665)
Interest (expense) income, net | (268) | 531 | (142)
Loss before income taxes | (27,427) | (49,490) | (19,807)
Income tax (expense) benefit | 52 | 96 | (571)
Net loss | $ (27,375) | $ (49,394) | $ (20,378)
Per share data: |  |  |
Basic and diluted loss per common share | $ (1.79) | $ (3.24) | $ (1.36)

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