Acquisitions (Tables)

9 Months Ended

Sep. 28, 2014

Business Combinations [Abstract]

Contingent compensation expenses

Contingent compensation expenses recorded as a result of acquisitions consist of the following (in thousands):

	Three Months Ended				Nine Months Ended
	September 28, 2014		September 29, 2013		September 28, 2014		September 29, 2013
Contingent compensation, included in research and development expense	$	496	$	106	$	1,075	$	432
Contingent compensation, included in selling, general and administrative expense	—		2,337		2,757		7,692
Total contingent compensation expense	$	496	$	2,443	$	3,832	$	8,124