Stock-Based Compensation and Employee Benefit Plans - Summary of the Activity under the VI Chip Stock Option Plans (Parenthetical) (Detail) - Vi Chip Plan [Member]	12 Months Ended
	Dec. 31, 2016 shares
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Granted, shares	5,000
Chief Executive Officer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Granted, shares	5,500,000