Available for Sale Marketable Debt Securities (Tables)

6 Months Ended

Jun. 30, 2014

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 June 30, 2014 ($ amounts in thousands):

							Estimated
			Unrealized				Fair
	Cost		Gain		(Loss)		Value
Corporate bonds	$	—	$	—	$	—	$	—

Available for sale marketable debt securities are generally classified as current on our condensed consolidated balance sheet.

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, 2013 ($ amounts in thousands):

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