Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Summary of Depreciation and Amortization Expense of Property and Equipment and Rental Equipment (Details)

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Summary of Significant Accounting Policies - Summary of Depreciation and Amortization Expense of Property and Equipment and Rental Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property Plant And Equipment [Line Items]      
Depreciation and amortization $ 13,926 $ 11,930 $ 8,341
Equipment      
Property Plant And Equipment [Line Items]      
Depreciation 11,965 10,339 7,132
Other property and equipment      
Property Plant And Equipment [Line Items]      
Depreciation and amortization $ 1,961 $ 1,591 $ 1,209