Goodwill and Purchased Intangible Assets - Additional Information (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Finite Lived Intangible Assets [Line Items]
Goodwill	$ 9,800,000		$ 9,800,000		$ 0
Cost	6,696,000		6,696,000		0
Amortization expense	$ 500,000	$ 0	$ 500,000	$ 0