Acquisitions (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended					1 Months Ended	12 Months Ended		12 Months Ended	0 Months Ended	12 Months Ended
	May 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jun. 13, 2012	Dec. 31, 2012 NuConomy [Member]	Nov. 30, 2012 Engage [Member]	Dec. 31, 2012 Engage [Member]	Nov. 09, 2012 Engage [Member]	Dec. 31, 2012 Amadesa [Member]	Jun. 13, 2012 LookIO [Member]	Dec. 31, 2012 LookIO [Member]
Business Acquisition [Line Items]
Costs related to earn out litigation		$ 77	$ 75	$ 95
Business acquisition, equity interest issued or issuable		2,050,000
Business acquisition, shares of common stock issued		1,127,985									109,517
Business acquisition, value of shares of common stock issued		8,894									1,984
Business acquisition, cash paid					900
Acquisition costs incurred to acquire entity							494					157
Business acquisition, acquisition Date								Nov. 09, 2012		May 31, 2012		Jun. 13, 2012
Business acquisition, purchase price		20							10,512		2,884
Cash consideration to acquire asset	10,301
Acquisition costs included in intangible assets		3,600							3,600	497	767
Assets acquired liabilities assumed, net									839
Technology asset acquired, aggregate cash consideration						800
Potential shares of common stock in addition to purchase price											30,422	30,422
Potential shares of common stock, value									$ 1,660			$ 551