Acquisitions - Summary of Estimated Fair Values of Purchase Price (Detail) (MobileNet [Member], USD $)	12 Months Ended
	Dec. 31, 2013
MobileNet [Member]
Business Acquisition [Line Items]
Cash	$ 3,231,000
Issuance of 329,344 shares of common stock (valued at $4.96 per share, which reflects the Company's common stock closing price on April 1, 2013)	1,634,000
Fair value of contingent earn-out amounts	1,539,000
Net identifiable assets acquired	$ 6,404,000