Related Party Transactions - Narrative (Details) (CEO [Member], Mandiant, Inc. [Member], USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended
	Dec. 31, 2013	Dec. 30, 2013
CEO [Member] | Mandiant, Inc. [Member]
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