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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 | 6 Months Ended | ||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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| Property Plant And Equipment [Line Items] | ||||
| Depreciation | $ 2,887 | $ 1,925 | $ 5,506 | $ 3,518 |
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Equipment
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| Property Plant And Equipment [Line Items] | ||||
| Depreciation | 2,503 | 1,624 | 4,760 | 2,966 |
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Other property and equipment
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| Property Plant And Equipment [Line Items] | ||||
| Depreciation | $ 384 | $ 301 | $ 746 | $ 552 |