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Property, Plant, and Equipment - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Property Plant And Equipment [Abstract]        
Depreciation expense $ 100 $ 200 $ 169 $ 363