Subsequent Event (Details) (USD $)	0 Months Ended
	Jan. 25, 2013 Lease agreement	Jan. 25, 2013 Lease agreement Subsequent Event sqft	Feb. 27, 2013 New stock repurchase program Subsequent Event
Subsequent Event [Line Items]
Area of leased research and development facility		98,874
Lease term	159 months
Annual rental costs		$ 2,100,000
Annual payment escalation percentage		3.00%
Authorized repurchase amount under the new stock repurchase program			$ 20,000,000.0