Quarterly report pursuant to Section 13 or 15(d)

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

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Summary of Significant Accounting Policies - Summary of Property Plant and Equipment and Rental Equipment with Related Accumulated Depreciation (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Property Plant And Equipment [Line Items]    
Property and equipment $ 48,106 $ 45,678
Accumulated depreciation 18,282 15,956
Property and equipment, net 29,824 29,722
Equipment
   
Property Plant And Equipment [Line Items]    
Property and equipment 39,832 37,573
Accumulated depreciation 14,508 12,545
Property and equipment, net 25,324 25,028
Other property and equipment
   
Property Plant And Equipment [Line Items]    
Property and equipment 8,274 8,105
Accumulated depreciation 3,774 3,411
Property and equipment, net $ 4,500 $ 4,694