Fair Value Measurement (Details 2) - Contingent acquisition consideration - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
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			$ (272)
Payments			57
Change in fair value	$ (28)	$ (491)	(6)	$ 657
Balance at the end of the period	$ (221)		$ (221)