Short-term Investments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	$ 19,900
Short-term Investments, Unrealized Gains	0
Short-term Investments, Unrealized Losses	(39)
Short-term Investments, Estimated Fair Value	19,861
Corporate bonds
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	14,262
Short-term Investments, Unrealized Gains	0
Short-term Investments, Unrealized Losses	(27)
Short-term Investments, Estimated Fair Value	14,235
Government bonds
Schedule Of Available For Sale Securities [Line Items]
Short-term Investments, Amortized Cost	5,638
Short-term Investments, Unrealized Gains	0
Short-term Investments, Unrealized Losses	(12)
Short-term Investments, Estimated Fair Value	$ 5,626