PROPERTY AND EQUIPMENT - Property and equipment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 22,258	$ 22,141
Less: Accumulated depreciation and amortization	20,266	19,202
Net property and equipment	1,992	2,939
Depreciation and amortization expense	1,064	1,172	1,425
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, Estimated Useful Life	5 years
Property and equipment, gross	12,824	12,733
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,620	4,594
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, Estimated Useful Life	3 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, Estimated Useful Life	10 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, Estimated Useful Life	7 years
Property and equipment, gross	1,175	1,175
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, Estimated Useful Life	3 years
Property and equipment, gross	$ 3,639	$ 3,639