Fair Value Measurement (Details 2) (Contingent acquisition consideration, USD $) In Thousands, unless otherwise specified	1 Months Ended		3 Months Ended		9 Months Ended
	Oct. 31, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Contingent acquisition consideration
Reconciliation of the beginning and ending balances for the liabilities measured at fair value using significant unobservable inputs (Level 3)
Balance at the beginning of the period	$ (1,802)				$ (1,537)
Payment of contingent consideration	1,370	300			(441)
Change in fair value			6	62	(663)	370
Contingent consideration		(43)	(43)		(43)
Balance at the end of the period		$ (1,802)	$ (1,802)		$ (1,802)