Cash, Cash Equivalents and Available-for-Sale Securities (Details 2) (Recurring basis, USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Level 2
Fair value measurements
Assets where Level 2 or Level 3 valuation techniques were used	$ 0	$ 0
Liabilities where Level 2 or Level 3 valuation techniques were used	0	0
Level 3
Fair value measurements
Assets where Level 2 or Level 3 valuation techniques were used	0	0
Liabilities where Level 2 or Level 3 valuation techniques were used	$ 0	$ 0