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12. Segment Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Revenues $ 171,526 $ 150,157
Cost of goods sold 166,121 146,782
Gross profit 5,405 3,375
Expenses    
Research and development expenses 246 2,367
Selling, general and administrative expenses 16,085 13,191
Interest expense 25,690 19,304
Accretion of Series A preferred units 44 0
Loss on impairment of intangibles 865 0
Other expense (income) (1,245) 277
Loss before income taxes (36,280) (31,764)
Capital expenditures 4,074 1,116
Depreciation 4,580 4,622
Total Assets 91,821 94,331
North America    
Revenues 150,045 136,739
Cost of goods sold 145,947 133,606
Gross profit 4,098 3,133
Expenses    
Research and development expenses 246 2,367
Selling, general and administrative expenses 15,204 12,134
Interest expense 25,076 18,991
Accretion of Series A preferred units 44 0
Loss on impairment of intangibles 865 0
Other expense (income) (1,208) 328
Loss before income taxes (36,129) (30,687)
Capital expenditures 2,746 802
Depreciation 3,968 4,001
Total Assets 78,149 80,479
India    
Revenues 21,481 13,418
Cost of goods sold 20,174 13,176
Gross profit 1,307 242
Expenses    
Research and development expenses 0 0
Selling, general and administrative expenses 881 1,057
Interest expense 614 313
Accretion of Series A preferred units 0 0
Loss on impairment of intangibles 0 0
Other expense (income) (37) (51)
Loss before income taxes (151) (1,077)
Capital expenditures 1,328 314
Depreciation 612 621
Total Assets $ 13,672 $ 13,852