Balance Sheet Accounts (Narratives) (Details) (USD $)	3 Months Ended				0 Months Ended	3 Months Ended	0 Months Ended		3 Months Ended
	Sep. 30, 2014 Investment_Securities	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Oct. 31, 2013 Revolving Facility	Sep. 30, 2014 Revolving Facility	Oct. 31, 2013 Term Loan	Oct. 31, 2013 Enterasys Networks, Inc. Revolving Facility	Sep. 30, 2014 Minimum	Sep. 30, 2014 Minimum Net Revenue Customer Concentration Risk	Sep. 30, 2014 Maximum	Sep. 30, 2014 Cash equivalents Maximum	Sep. 30, 2014 Short-term Investments Minimum	Sep. 30, 2014 Short-term Investments Maximum	Sep. 30, 2014 Marketable Securities Minimum
Balance Sheet Accounts [Line Items]
Maturity period for investments												3 months	3 months	1 year	1 year
Number of securities with unrealized losses	4
Number of investment securities	18
Extended warranty period									1 year		5 years
Borrowing capacity					$ 60,000,000		$ 65,000,000
Term of agreement					5 years		5 years
Borrowings under Revolving Facility	24,000,000	0				24,000,000		35,000,000
Repayments under Revolving Facility						24,000,000
Warranty liability	$ 7,889,000	$ 3,440,000	$ 7,551,000	$ 3,296,000
Standard hardware warranty period	12 months
Standard software warranty period	90 days
Limited lifetime hardware warranty maximum period after end of sale of product	5 years
Maximum investment in one obligor or maker (percent)	10.00%
Concentration risk										10.00%