Summary of Significant Accounting Policies - Estimated Useful Lives of the Principal Classes (Details) |
12 Months Ended |
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Dec. 31, 2017 | |
| Machinery and equipment | |
| Property, Plant and Equipment [Line Items] | |
| Estimated useful lives (in years) | 5 years |
| Furniture, fixtures and computers | Minimum | |
| Property, Plant and Equipment [Line Items] | |
| Estimated useful lives (in years) | 3 years |
| Furniture, fixtures and computers | Maximum | |
| Property, Plant and Equipment [Line Items] | |
| Estimated useful lives (in years) | 5 years |
| Building leasehold improvements | |
| Property, Plant and Equipment [Line Items] | |
| Property, Plant and Equipment, Estimated Useful Lives | Shorter of lease term or useful life |
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- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. No definition available.
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