Goodwill and Intangible Assets, Net - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Goodwill [Line Items]
Goodwill acquired			$ 3,349,000
Goodwill impairment	$ 0	$ 0	0	$ 0
Amortization	$ 600,000	$ 400,000	1,590,000	$ 1,200,000
SecurityTrax
Goodwill [Line Items]
Goodwill acquired			$ 3,300,000