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)

v3.6.0.2
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, 2016
Dec. 31, 2015
Property Plant And Equipment [Abstract]    
Rental equipment, allowance $ 725 $ 850