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Equipment Lease Obligations - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Capital Leased Assets [Line Items]          
Remaining minimum lease payment due within one year $ 432   $ 432    
Equipment          
Capital Leased Assets [Line Items]          
Assets under equipment leases, gross 1,484   1,484   $ 1,484
Leased assets, depreciation expense $ 54 $ 73 $ 109 $ 146