Intangible Assets and Goodwill - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015	Sep. 30, 2015	Sep. 30, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible assets and goodwill impairment			$ 0
Amortization expense	$ 14,000	$ 17,000		$ 49,000	$ 52,000