Goodwill and Intangible Assets Net - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Dispose, impair or recognition of additional goodwill	$ 0		$ 0
Impairment charges on goodwill			0
Amortization of intangible assets	51,000	$ 51,000	101,000	$ 101,000
Impairment losses recognized related to the acquired intangible assets	0	$ 0	0	$ 0
Annual amortization expense of the intangible assets, 2016 (remaining six months)	100,000		100,000
Annual amortization expense of the intangible assets, 2017	200,000		200,000
Annual amortization expense of the intangible assets, 2018	200,000		200,000
Annual amortization expense of the intangible assets, 2019	200,000		200,000
Annual amortization expense of the intangible assets, 2020	$ 100,000		$ 100,000