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Equipment Lease Obligations - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Capital Leased Assets [Line Items]        
Capital leased assets, depreciation expense $ 73 $ 73 $ 219 $ 219
Equipment        
Capital Leased Assets [Line Items]        
Capital leased assets, gross $ 2,853   $ 2,853