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15. Parent Company Financial Statements (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Selling, general and administrative expenses $ 16,882 $ 17,424
Operating loss (6,070) (4,931)
Other expense    
Interest expense 26,344 25,755
Other (income) expense (548) 797
Loss before income taxes (37,635) (38,346)
Income tax expense 976 (1,131)
Net loss (36,659) (39,477)
Other comprehensive loss    
Foreign currency translation adjustment (289) (249)
Comprehensive loss (36,948) (39,726)
Parent Company Financial Statements    
Equity in subsidiary losses (28,820) (21,745)
Selling, general and administrative expenses 6,707 6,673
Operating loss (35,527) (28,418)
Other expense    
Interest expense 677 1,392
Other (income) expense 448 5,899
Loss before income taxes (36,652) (35,709)
Income tax expense 7 7
Net loss (36,659) (35,716)
Other comprehensive loss    
Foreign currency translation adjustment (289) (249)
Comprehensive loss $ (36,948) $ (35,965)