Available for Sale Marketable Debt Securities (Tables)

12 Months Ended

Dec. 31, 2013

Available-for-sale Securities [Abstract]

Summary of Amortized Cost and Estimated Fair Value of Available for Sale Marketable Debt Securities

The following is a summary of amortized cost and estimated fair value of our marketable debt securities available for sale at December 31, 2013 ($ amounts in thousands):

			Unrealized				Estimated Fair Value
	Cost		Gain		(Loss)
Corporate bonds		$3,522		$19		$—		$3,541

All available for sale marketable debt securities are classified as current on our consolidated balance sheet as of December 31, 2013.

The following is a summary of amortized cost and estimated fair value of our investments in marketable debt securities available for sale at December 31, 2012 ($ amounts in thousands):

			Unrealized				Estimated Fair Value
	Cost		Gain		(Loss)
Corporate bonds		$11,666		$61		$—		$11,727

Summary of Contractual Maturities of Available for Sale Debt Securities

The following is a summary of the contractual maturities of our available for sale debt securities at December 31, 2013 ($ amounts in thousands):

	December 31, 2013
	Cost		Estimated Fair Value
Less than one year		$2,616		$2,624
Due between 1-2 years	906		917
Total		$3,522		$3,541