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Assets - Current Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Assets          
Allowance for doubtful accounts receivable $ 300   $ 300   $ 300
Inventories          
Materials 58,372   58,372   46,457
Work-in-process 46,498   46,498   25,250
Finished goods 15,065   15,065   5,356
Total 119,935   119,935   77,063
Prepaid expenses and other current assets          
Supplier deposits against purchase commitments 7,900   7,900   $ 7,800
Asset held for sale, carrying value 2,300   2,300    
Asset impairment charges $ 675 $ 13,627 $ 1,138 $ 13,627