Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 1,460	$ 1,446
Accumulated amortization	(379)	(296)
Intangibles, net	1,081	1,150
Intangible asset amortization	100	100	$ 100
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	100
Finite-Lived Intangible Assets, Amortization Expense, Year Two	100
Finite-Lived Intangible Assets, Amortization Expense, Year Three	100
Finite-Lived Intangible Assets, Amortization Expense, Year Four	100
Finite-Lived Intangible Assets, Amortization Expense, Year Five	100
Patents
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1,081	1,067
Licenses
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 379	$ 379