Acquisitions (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended		6 Months Ended		0 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Nov. 09, 2012	Jun. 30, 2013 Amadesa Ltd. [Member]	May 31, 2012 Amadesa Ltd. [Member]	Jun. 13, 2012 Look.io [Member]	Jun. 30, 2013 Look.io [Member]	Dec. 31, 2012 Look.io [Member]	Jun. 30, 2013 Engage Pty Ltd. [Member]	Dec. 31, 2012 Engage Pty Ltd. [Member]	Nov. 09, 2012 Engage Pty Ltd. [Member]
Business Acquisition [Line Items]
Acquisition costs incurred to acquire entity							$ 157		$ 494
Acquisition costs included in intangible assets		3,600	497		767			3,600
Business acquisition, purchase price cash		10,591			2,884					10,591
Business acquisition, shares of common stock issued					109,517
Business acquisition, value of shares of common stock issued					1,984
Acquired intangible asset, aggregate cash consideration				10,301
Potential shares of common stock in addition to purchase price					30,422
Potential shares of common stock, value						551				1,660
Business acquisition, acquisition Date			May 31, 2012			Jun. 13, 2012		Nov. 09, 2012
Business acquisition, cash paid					900
Weighted average shares outstanding used in basic and diluted net income per share as of the acquisition date							109,517
Assets acquired liabilities assumed, net										839
Net working capital adjustment	$ 79