RESTRUCTURING AND OTHER CHARGES - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013 facility	Dec. 31, 2012		Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 412,000	$ 3,662,000	$ 5,070,000
Number of vacated leased facilities		2
Accrued restructuring charges	400,000	1,103,000	3,605,000		2,743,000
Payments	(1,097,000)	(6,127,000)	(4,084,000)
Restructuring reserve, current	366,000	812,000
Accrued liabilities, current
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, current		800,000
Other liabilities, noncurrent
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, noncurrent		300,000
Employee severance costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	506,000	2,413,000	4,011,000
Severance expense	600,000
Accrued restructuring charges	128,000	0	2,005,000		82,000
Payments	(358,000)	(4,406,000)	(2,190,000)
Employee severance and other costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,800,000		4,700,000
Payments	(4,800,000)		(2,700,000)
Contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(94,000)	825,000	355,000
Accrued restructuring charges	238,000	1,103,000	1,600,000		2,661,000
Payments	(739,000)	(1,322,000)	(1,420,000)
Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	424,000	704,000	[1]
Accrued restructuring charges	0	0	0		0
Payments	$ 0	$ (399,000)	$ (474,000)

[1] $0.2 million charge related to impairment of property and equipment resulting from the transfer of our research, development and prototype production of the Millios system to our facility in Dornstadt, Germany and the consolidation of global manufacturing in our facility in Fremont, California.