Significant Accounting Policies - Goodwill (Details) (USD $) In Millions, unless otherwise specified		6 Months Ended
Apr. 02, 2012 PhaseLink Acquisition [Member]	Jun. 30, 2014 Discera, Inc. [Member]	Sep. 09, 2013 Discera, Inc. [Member]
Goodwill [Line Items]
Goodwill, Gross	$ 6.1	$ 2.6	$ 2.5
Goodwill, Other Changes		$ 0.1

Amount of other (increase) decrease of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

Name:	us-gaap_GoodwillOtherChanges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration