Acquisitions - Additional Information (Detail) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Jul. 08, 2014
Business Acquisition [Line Items]
Amortization expense of intangibles	$ 93,000	$ 56,000
Path Logic [Member]
Business Acquisition [Line Items]
Business acquisition purchase price			5,908,000
Amortization expense of intangibles	37,000
Acquired intangible assets			1,930,000
Intangible asset amortization period			13 years
Goodwill expected tax deductible amount	$ 3,700,000
Amortization Period	15 years