Acquisition - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		0 Months Ended	3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jul. 08, 2014 Path Logic [Member]	Sep. 30, 2014 Path Logic [Member]	Sep. 30, 2014 Path Logic [Member]	Jul. 08, 2014 Path Logic [Member]	Sep. 30, 2014 Path Logic [Member] General and Administrative Expense [Member]	Sep. 30, 2014 Path Logic [Member] General and Administrative Expense [Member]
Business Acquisition [Line Items]
Business acquisition purchase price								$ 5,908,000
Amortization expense of intangibles	89,000	56,000	200,000	168,000		33,000	33,000
Acquired intangible assets								1,860,000
Intangible asset amortization period					13 years
Diligence and transaction expenses related to acquisition									$ 361,000	$ 361,000