CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restructuring expense	$ 2,067,000	$ 110,000	$ 2,269,000
Amortization of Intangible Assets	2,949,000	1,331,000	1,585,000
Cost of product revenue
Restructuring expense	284,000
Amortization of Intangible Assets	975,000	425,000
Stock-based compensation expense	603,000	523,000	670,000
Research and development
Amortization of Intangible Assets	1,033,000	307,000
Stock-based compensation expense	3,576,000	3,585,000	3,774,000
Selling, general and administrative
Stock-based compensation expense	$ 6,336,000	$ 5,096,000	$ 5,076,000