Stock-Based Compensation and Employee Benefit Plans - Summary of the Activity under the VI Chip Stock Option Plans (Detail) - Vi Chip Plan [Member] - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Options Outstanding, Beginning balance		10,715,000
Options Outstanding, Granted		82,500
Options Outstanding, Forfeited and expired		(699,000)
Options Outstanding, Exercised		(1,000)
Options Outstanding, Ending balance	10,715,000	10,097,500
Options Outstanding, Exercisable	7,377,950	7,042,600	7,267,600
Options Outstanding, Vested or expected to vest		9,821,129
Weighted Average Exercise Price, Beginning balance		$ 1.00
Weighted Average Exercise Price, Granted		1.00
Weighted Average Exercise Price, Forfeited and expired		1.00
Weighted Average Exercise Price, Exercised		1.00
Weighted Average Exercise Price, Ending balance	$ 1.00	1.00
Weighted Average Exercise Price, Exercisable	$ 1.00	1.00	$ 1.00
Weighted Average Exercise Price, Vested or expected to vest		$ 1.00
Weighted-Average Remaining Contractual Life in Years, Outstanding		2 years 10 months 13 days
Weighted-Average Remaining Contractual Life in Years, Exercisable		1 year 9 months
Weighted-Average Remaining Contractual Life in Years, Vested or expected to vest		2 years 9 months 18 days
Aggregate Intrinsic Value, Outstanding		$ 0
Aggregate Intrinsic Value, Exercisable		0
Aggregate Intrinsic Value, Vested or expected to vest		$ 0