Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Summary of Property Plant and Equipment and Rental Equipment with Associated Accumulated Depreciation (Parenthetical) (Details)

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Summary of Significant Accounting Policies - Summary of Property Plant and Equipment and Rental Equipment with Associated Accumulated Depreciation (Parenthetical) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property Plant And Equipment [Abstract]    
Rental equipment, allowance $ 754 $ 725