Acquisition - Additional Information (Details) (USD $) In Millions, unless otherwise specified			0 Months Ended			0 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Mar. 21, 2014 Zopim	Mar. 21, 2014 Zopim Common Stock Consideration	Mar. 21, 2014 Zopim Cash	Mar. 21, 2014 Zopim Minimum	Mar. 21, 2014 Zopim Maximum
Business Acquisition [Line Items]
Adjustments to the preliminary purchase price allocation			$ 0.2
Business acquisition, fair value of consideration transferred			15.8
Business acquisition, fair value of consideration transferred, cash			4.9
Business acquisition, fair value of consideration transferred, common stock			10.9
Cash portion of fair value consideration transferred				2.4	1.1
Number of months that cash and shares were held back						12 months	18 months
Business acquisition, goodwill	9.8	0	9.6
Business acquisition, identifiable intangible assets			6.6
Business acquisition liabilities assumed, net			0.4
RSUs issued pursuant to retention plan, in connection with the acquisition			0.9
Cash to be pay pursuant to retention plan, in connection with the acquisition			$ 3.0