PROPERTY AND EQUIPMENT (Useful Lives and Depreciation) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property and Equipment
Depreciation and amortization of property and equipment	$ 7.3	$ 5.3	$ 3.5
Computer hardware
Property and Equipment
Estimated useful lives	3 years
Computer software
Property and Equipment
Estimated useful lives	3 years
Machinery, equipment and tooling | Minimum
Property and Equipment
Estimated useful lives	2 years
Machinery, equipment and tooling | Maximum
Property and Equipment
Estimated useful lives	3 years
Furniture and fixtures
Property and Equipment
Estimated useful lives	7 years
Leasehold improvements | Minimum
Property and Equipment
Estimated useful lives	3 years
Leasehold improvements | Maximum
Property and Equipment
Estimated useful lives	10 years