Quarterly report pursuant to Section 13 or 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, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Property Plant And Equipment [Line Items]    
Depreciation $ 2,619 $ 1,593
Equipment
    
Property Plant And Equipment [Line Items]    
Depreciation 2,257 1,342
Other property and equipment
    
Property Plant And Equipment [Line Items]    
Depreciation $ 362 $ 251