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Equipment Lease Obligations - Additional Information (Detail) - Equipment - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Capital Leased Assets [Line Items]      
Assets under equipment leases, gross $ 2,853    
Assets under equipment leases, depreciation expense 293 $ 293 $ 245
Accumulated depreciation, capital leased assets under equipment leases $ 757 $ 464