Subsequent Event (Details) (Subsequent Event, Equipment Leased to Other Party, Powerchip Technology Corporation, USD $) In Millions, unless otherwise specified	0 Months Ended
	Apr. 20, 2015	Apr. 20, 2015
Subsequent Event | Equipment Leased to Other Party | Powerchip Technology Corporation
Subsequent Event [Line Items]
Amount the company will purchase and then lease (up to aggregate of $73.5 million)	$ 73.5
Term of lease agreements	6 years
Amount of quarterly payments	$ 82.1	$ 82.1
Additional renewal period	3 years