Related Party Transactions - Narrative (Details) - CEO - Mandiant, Inc. - USD ($) $ in Millions	Dec. 31, 2013	Dec. 30, 2013
Related Party Transaction [Line Items]
Shares held (in shares)		740,166
Unvested shares subject to forfeiture in event of termination (in shares)		328,960
Aggregate merger consideration	$ 28.6
Consideration transferred, cash paid	$ 3.9
Consideration transferred, shares of common stock (in shares)	601,439
Consideration transferred, shares held in escrow (in shares)	87,335