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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 | 9 Months Ended | ||
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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| Property Plant And Equipment [Line Items] | ||||
| Depreciation and amortization | $ 3,148 | $ 2,274 | $ 8,654 | $ 5,792 |
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Equipment
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| Property Plant And Equipment [Line Items] | ||||
| Depreciation and amortization | 2,752 | 1,955 | 7,512 | 4,921 |
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Other property and equipment
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| Property Plant And Equipment [Line Items] | ||||
| Depreciation and amortization | $ 396 | $ 319 | $ 1,142 | $ 871 |