Annual report pursuant to Section 13 and 15(d)

Accounting Policies - Summary of Depreciation on Property and Equipment (Detail)

v3.8.0.1
Accounting Policies - Summary of Depreciation on Property and Equipment (Detail)
 12 Months Ended
Dec. 31, 2017
Computer equipment [Member]  
Property, Plant and Equipment [Line Items]  
Useful life 3 years
Furniture and fixtures [Member]  
Property, Plant and Equipment [Line Items]  
Useful life 5 years
Machinery and equipment [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Useful life 5 years
Machinery and equipment [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Useful life 10 years
Leasehold improvements and equipment under capital lease [Member]  
Property, Plant and Equipment [Line Items]  
Leasehold improvements and equipment under capital lease Over the term of the lease