Available for Sale Marketable Debt Securities (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2014 ($ amounts in thousands):

							Estimated
			Unrealized				Fair
	Cost		Gain		(Loss)		Value
Corporate bonds	$	2,508	$	9	$	—	$	2,517

All available for sale marketable debt securities are classified as current on our condensed consolidated balance sheet as of March 31, 2014.

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

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 March 31, 2014 ($ amounts in thousands):

	March 31, 2014
			Estimated Fair
	Cost		Value
Less than one year	$	2,508	$	2,517
Total	$	2,508	$	2,517