BALANCE SHEET DETAILS AND OTHER FINANCIAL INFORMATION - Goodwill and Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	0 Months Ended
	Sep. 30, 2014	Jan. 17, 2014 Luna Innovations, Inc. [Member]	Jun. 25, 2014 Adachi Co., Ltd [Member]	Jun. 25, 2014 Adachi Co., Ltd [Member] Reacquired Rights [Member]	Jun. 25, 2014 Adachi Co., Ltd [Member] Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Increase in goodwill	$ 60.6
Increase in intangible assets	16.2
Acquisition of intangible assets		9.5		5.5	17.2
Acquired intangible assets, weighted average amortization period		9 years		1 year 1 month 6 days	7 years
Goodwill, acquired during the period		10.1	50.5
Liabilities assumed in connection with acquisition			2.7
Assets acquired in connection with acquisition			2.5
Purchase consideration, cash			71.2
Purchase consideration, contingent liability			$ 1.8