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Summary of Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Detail)
12 Months Ended
Dec. 31, 2016
Research Equipment and Software [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 25 years
Research Equipment and Software [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 33 years
Leasehold Improvements [Member]  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 10 years
Furniture and Office Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life 7 years