Intangible and Other Assets, Net - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible assets, amortization expense	$ 40,000	$ 29,000	$ 25,000
Finite lived intangible assets, estimated future amortization expense year one	43,000
Finite lived intangible assets, estimated future amortization expense year two	43,000
Finite lived intangible assets, estimated future amortization expense year three	43,000
Finite lived intangible assets, estimated future amortization expense year four	43,000
Finite lived intangible assets, estimated future amortization expense year five	43,000
Finite lived intangible assets, estimated future amortization expense after year five	$ 375,000
Weighted Average
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible assets, Weighted average amortization period	17 years	17 years	17 years