Acquisitions (Details Textual) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 09, 2013	Aug. 30, 2013	Dec. 20, 2012	Apr. 02, 2012
Business Acquisition [Line Items]
Payments to acquire remaining noncontrolling interest	$ 0	$ 6,122,000	$ 0
Discera, Inc. [Member]
Business Acquisition [Line Items]
Date of acquisition agreement					Aug. 30, 2013
Acquisition effective date				Sep. 09, 2013
Total purchase price				7,200,000
Short-term debt				(1,100,000)
Business Acquisition, Cash paid at closing				6,100,000
Business Acquisition, Cash Withheld				1,100,000
Payment of restricted cash	1,000,000
Goodwill, Other Changes	100,000
Goodwill	2,600,000
PhaseLink Acquisition [Member]
Business Acquisition [Line Items]
Acquisition effective date							Apr. 02, 2012
Percentage of outstanding shares acquired						5.00%	95.00%
Total purchase price							19,700,000
Payments to acquire remaining noncontrolling interest						900,000
Resulting ownership percentage in PhaseLink						100.00%
Business Acquisition, Cash paid at closing							$ 16,400,000
Customer relationships [Member] | Discera, Inc. [Member]
Business Acquisition [Line Items]
Identifiable intangible assets estimated useful life	3 years
Customer relationships [Member] | PhaseLink Acquisition [Member]
Business Acquisition [Line Items]
Identifiable intangible assets estimated useful life	10 years
Noncompete Agreements [Member] | Discera, Inc. [Member]
Business Acquisition [Line Items]
Identifiable intangible assets estimated useful life	1 year
Noncompete Agreements [Member] | PhaseLink Acquisition [Member]
Business Acquisition [Line Items]
Identifiable intangible assets estimated useful life	2 years
Trademarks [Member] | Discera, Inc. [Member]
Business Acquisition [Line Items]
Identifiable intangible assets estimated useful life	10 years
Developed Technology Rights [Member] | Discera, Inc. [Member]
Business Acquisition [Line Items]
Identifiable intangible assets estimated useful life	10 years
Developed Technology Rights [Member] | PhaseLink Acquisition [Member]
Business Acquisition [Line Items]
Identifiable intangible assets estimated useful life	10 years
Minimum [Member] | Trademarks [Member] | PhaseLink Acquisition [Member]
Business Acquisition [Line Items]
Identifiable intangible assets estimated useful life	2 years
Maximum [Member] | Trademarks [Member] | PhaseLink Acquisition [Member]
Business Acquisition [Line Items]
Identifiable intangible assets estimated useful life	5 years